Multiply two string numbers

Here given code implementation process.

// Java program
// Multiply two string numbers
class MyString
{
	//Add two string numbers
	public String addition(String str1, String str2)
	{
		//Get the last location
		int size1 = str1.length() - 1;
		int size2 = str2.length() - 1;
		//Use to store the result
		String result = "";
		int num1 = 0;
		int num2 = 0;
		int carry = 0;
		//Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		{
			num1 = 0;
			num2 = 0;
			if (size1 >= 0)
			{
				//Get the first number 
				num1 = str1.charAt(size1) - '0';
			}
			if (size2 >= 0)
			{
				//Get the second number 
				num2 = str2.charAt(size2) - '0';
			}
			carry = carry + num1 + num2;
			//add sum into the result 
			result = carry % 10 + result;
			if (carry != 0)
			{
				carry /= 10;
			}
			//get next location
			//modified string text location
			size1--;
			size2--;
		}
		return result;
	}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	public void mutiply(String str1, String str2)
	{
		//Get the size of numeric string
		int size1 = str1.length() - 1;
		int size2 = str2.length() - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		String result = "";
		String temp = "";
		String zeros = "";
		//arithmetic operation variable
		int num1 = 0;
		int num2 = 0;
		long carry = 0;
		//Loop contolling variables
		int i = 0, k = 0;
		int num1_negative = 0;
		int num2_negative = 0;
		if (str1.charAt(0) == '-')
		{
			num1_negative = 1;
		}
		if (str2.charAt(0) == '-')
		{
			num2_negative = 1;
		}
		for (i = size2; i >= num2_negative; i--)
		{
			k = size1;
			temp = "";
			num1 = str2.charAt(i) - '0';
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = str1.charAt(k) - '0';
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = carry % 10 + temp;
				if (carry != 0)
				{
					carry = carry / 10;
				}
				//modified string text location
				k--;
			}
			temp = temp + zeros;
			result = addition(temp, result);
			zeros += "0";
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			//When one number is nagative
			System.out.print("\n(" + str1 + ") * (" + str2 + ") = -" + result);
		}
		else
		{
			System.out.print("\n(" + str1 + ") * (" + str2 + ") = " + result);
		}
	}
	public static void main(String[] args)
	{
		MyString obj = new MyString();
		//Some test case
		obj.mutiply("14", "2");
		obj.mutiply("3", "9");
		//When one number is negative
		obj.mutiply("-14", "2");
		//When both number is negative
		obj.mutiply("-2", "-2");
		//When number is large
		obj.mutiply("7564353234554", "3233243424212128534124678");
		obj.mutiply("3233243424212128534124678", "7564353234554");
	}
}

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
//Include header file
#include <iostream>
#include<string.h>

using namespace std;

// C++ program
// Multiply two string numbers
class MyString
{
	public:
		//Add two string numbers
		string addition(string str1, string str2)
		{
			//Get the last location
			int size1 = str1.size() - 1;
			int size2 = str2.size() - 1;
			//Use to store the result
			string result = "";
			int num1 = 0;
			int num2 = 0;
			int carry = 0;
			//Execute loop to get both string number 
			while (size1 >= 0 || size2 >= 0 || carry != 0)
			{
				num1 = 0;
				num2 = 0;
				if (size1 >= 0)
				{
					//Get the first number 
					num1 = str1[size1] - '0';
				}
				if (size2 >= 0)
				{
					//Get the second number 
					num2 = str2[size2] - '0';
				}
				carry = carry + num1 + num2;
				//add sum into the result 
				result = to_string(carry % 10) + result;
				if (carry != 0)
				{
					carry /= 10;
				}
				//get next location
				//modified string text location
				size1--;
				size2--;
			}
			return result;
		}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	void mutiply(string str1, string str2)
	{
		//Get the size of numeric string
		int size1 = str1.size() - 1;
		int size2 = str2.size() - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		string result = "";
		string temp = "";
		string zeros = "";
		//arithmetic operation variable
		int num1 = 0;
		int num2 = 0;
		long carry = 0;
		//Loop contolling variables
		int i = 0, k = 0;
		int num1_negative = 0;
		int num2_negative = 0;
		if (str1[0] == '-')
		{
			num1_negative = 1;
		}
		if (str2[0] == '-')
		{
			num2_negative = 1;
		}
		for (i = size2; i >= num2_negative; i--)
		{
			k = size1;
			temp = "";
			num1 = str2[i] - '0';
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = str1[k] - '0';
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = to_string(carry % 10) + temp;
				if (carry != 0)
				{
					carry = carry / 10;
				}
				//modified string text location
				k--;
			}
			temp = temp + zeros;
			result = this->addition(temp, result);
			zeros += "0";
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			//When one number is nagative
			cout << "\n(" << str1 << ") * (" << str2 << ") = -" << result;
		}
		else
		{
			cout << "\n(" << str1 << ") * (" << str2 << ") = " << result;
		}
	}
};
int main()
{
	MyString obj = MyString();
	//Some test case
	obj.mutiply("14", "2");
	obj.mutiply("3", "9");
	//When one number is negative
	obj.mutiply("-14", "2");
	//When both number is negative
	obj.mutiply("-2", "-2");
	//When number is large
	obj.mutiply("7564353234554", "3233243424212128534124678");
	obj.mutiply("3233243424212128534124678", "7564353234554");
	return 0;
}

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
//Include namespace system
using System;
// C# program
// Multiply two string numbers
class MyString
{
	//Add two string numbers
	public String addition(String str1, String str2)
	{
		//Get the last location
		int size1 = str1.Length - 1;
		int size2 = str2.Length - 1;
		//Use to store the result
		String result = "";
		int num1 = 0;
		int num2 = 0;
		int carry = 0;
		//Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		{
			num1 = 0;
			num2 = 0;
			if (size1 >= 0)
			{
				//Get the first number 
				num1 = str1[size1] - '0';
			}
			if (size2 >= 0)
			{
				//Get the second number 
				num2 = str2[size2] - '0';
			}
			carry = carry + num1 + num2;
			//add sum into the result 
			result = carry % 10 + result;
			if (carry != 0)
			{
				carry /= 10;
			}
			//get next location
			//modified string text location
			size1--;
			size2--;
		}
		return result;
	}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	public void mutiply(String str1, String str2)
	{
		//Get the size of numeric string
		int size1 = str1.Length - 1;
		int size2 = str2.Length - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		String result = "";
		String temp = "";
		String zeros = "";
		//arithmetic operation variable
		int num1 = 0;
		int num2 = 0;
		long carry = 0;
		//Loop contolling variables
		int i = 0, k = 0;
		int num1_negative = 0;
		int num2_negative = 0;
		if (str1[0] == '-')
		{
			num1_negative = 1;
		}
		if (str2[0] == '-')
		{
			num2_negative = 1;
		}
		for (i = size2; i >= num2_negative; i--)
		{
			k = size1;
			temp = "";
			num1 = str2[i] - '0';
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = str1[k] - '0';
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = carry % 10 + temp;
				if (carry != 0)
				{
					carry = carry / 10;
				}
				//modified string text location
				k--;
			}
			temp = temp + zeros;
			result = addition(temp, result);
			zeros += "0";
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			//When one number is nagative
			Console.Write("\n(" + str1 + ") * (" + str2 + ") = -" + result);
		}
		else
		{
			Console.Write("\n(" + str1 + ") * (" + str2 + ") = " + result);
		}
	}
	public static void Main(String[] args)
	{
		MyString obj = new MyString();
		//Some test case
		obj.mutiply("14", "2");
		obj.mutiply("3", "9");
		//When one number is negative
		obj.mutiply("-14", "2");
		//When both number is negative
		obj.mutiply("-2", "-2");
		//When number is large
		obj.mutiply("7564353234554", "3233243424212128534124678");
		obj.mutiply("3233243424212128534124678", "7564353234554");
	}
}

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
<?php
// Php program
// Multiply two string numbers
class MyString
{
  //Add two string numbers
  public  function addition($str1, $str2)
  {
    //Get the size 
    $size1 = strlen($str1) - 1;
    $size2 = strlen($str2) - 1;
    //Use to store the result
    $result = "";
    $num1 = 0;
    $num2 = 0;
    $carry = 0;
    //Execute loop to get both string number 
    while ($size1 >= 0 || $size2 >= 0 || $carry != 0)
    {
      $num1 = 0;
      $num2 = 0;
      if ($size1 >= 0)
      {
        //Get the first number 
        $num1 = ord($str1[$size1]) - ord('0');
      }
      if ($size2 >= 0)
      {
        //Get the second number 
        $num2 = ord($str2[$size2]) - ord('0');
      }
      $carry = $carry + $num1 + $num2;
      //add sum into the result 
      $result = ($carry % 10) . $result;
      if ($carry != 0)
      {
        $carry = intval($carry / 10);
      }
      //get next location
      //modified string text location
      $size1--;
      $size2--;
    }
  
    return $result;
  }
  //mutiply two string numbers
  //Assuming that given both strings is valid numbers
  public  function mutiply($str1, $str2)
  {
    //Get the size of numeric string
    $size1 = strlen($str1) - 1;
    $size2 = strlen($str2) - 1;
    if ($size1 < 0 || $size2 < 0)
    {
      return;
    }
    //Use to store the result
    $result = "";
    $temp = "";
    $zeros = "";
    //arithmetic operation variable
    $num1 = 0;
    $num2 = 0;
    $carry = 0;
    //Loop contolling variables
    $i = 0;
    $k = 0;
    $num1_negative = 0;
    $num2_negative = 0;
    if ($str1[0] == '-')
    {
      $num1_negative = 1;
    }
    if ($str2[0] == '-')
    {
      $num2_negative = 1;
    }
    for ($i = $size2; $i >= $num2_negative; $i--)
    {
      $k = $size1;
      $temp = "";
      $num1 = ord($str2[$i]) - ord('0');
      //multiply num1 into another string elements
      while ($k >= $num1_negative || $carry != 0)
      {
        if ($k >= $num1_negative)
        {
          //Get the second number 
          $num2 = ord($str1[$k]) - ord('0');
        }
        else
        {
          $num2 = 0;
        }
        $carry = $carry + ($num1 * $num2);
        //add last digit of carray
        $temp = ($carry % 10) . $temp;
        if ($carry != 0)
        {
          $carry = intval($carry / 10);
        }
        //modified string text location
        $k--;
      }
      $temp = $temp . $zeros;

      $result = $this->addition($temp, $result);

      $zeros = $zeros . "0";
    }
    if (($num1_negative == 1 && $num2_negative == 0) || ($num1_negative == 0 && $num2_negative == 1))
    {
      echo "\n(". $str1 .") * (". $str2 .") = -". $result;
    }
    else
    {
      echo "\n(". $str1 .") * (". $str2 .") = ". $result;
    }
  }
}

function main()
{
  $obj = new MyString();
  //Some test case
  $obj->mutiply("14", "2");
  $obj->mutiply("3", "9");
  //When one number is negative
  $obj->mutiply("-14", "2");
  //When both number is negative
  $obj->mutiply("-2", "-2");
  //When number is large
  $obj->mutiply("7564353234554", "3233243424212128534124678");
  $obj->mutiply("3233243424212128534124678", "7564353234554");
}
main();

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
// Node Js program
// Multiply two string numbers
class MyString
{
	//Add two string numbers
	addition(str1, str2)
	{
		//Get the last location
		var size1 = str1.length - 1;
		var size2 = str2.length - 1;
		//Use to store the result
		var result = "";
		var num1 = 0;
		var num2 = 0;
		var carry = 0;
		//Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		{
			num1 = 0;
			num2 = 0;
			if (size1 >= 0)
			{
				//Get the first number 
				num1 = str1.charAt(size1) - '0';
			}
			if (size2 >= 0)
			{
				//Get the second number 
				num2 = str2.charAt(size2) - '0';
			}
			carry = carry + num1 + num2;
			//add sum into the result 
			result = carry % 10 + result;
			if (carry != 0)
			{
				carry = parseInt(carry / 10);
			}
			//get next location
			//modified string text location
			size1--;
			size2--;
		}
		return result;
	}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	mutiply(str1, str2)
	{
		//Get the size of numeric string
		var size1 = str1.length - 1;
		var size2 = str2.length - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		var result = "";
		var temp = "";
		var zeros = "";
		//arithmetic operation variable
		var num1 = 0;
		var num2 = 0;
		var carry = 0;
		//Loop contolling variables
		var i = 0;
		var k = 0;
		var num1_negative = 0;
		var num2_negative = 0;
		if (str1.charAt(0) == '-')
		{
			num1_negative = 1;
		}
		if (str2.charAt(0) == '-')
		{
			num2_negative = 1;
		}
		for (i = size2; i >= num2_negative; i--)
		{
			k = size1;
			temp = "";
			num1 = str2.charAt(i) - '0';
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = str1.charAt(k) - '0';
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = carry % 10 + temp;
				if (carry != 0)
				{
					carry = parseInt(carry / 10);
				}
				//modified string text location
				k--;
			}
			temp = temp + zeros;
			result = this.addition(temp, result);
			zeros += "0";
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			process.stdout.write("\n(" + str1 + ") * (" + str2 + ") = -" + result);
		}
		else
		{
			process.stdout.write("\n(" + str1 + ") * (" + str2 + ") = " + result);
		}
	}
}

function main()
{
	var obj = new MyString();
	//Some test case
	obj.mutiply("14", "2");
	obj.mutiply("3", "9");
	//When one number is negative
	obj.mutiply("-14", "2");
	//When both number is negative
	obj.mutiply("-2", "-2");
	//When number is large
	obj.mutiply("7564353234554", "3233243424212128534124678");
	obj.mutiply("3233243424212128534124678", "7564353234554");
}
main();

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
#  Python 3 program
#  Multiply two string numbers
class MyString :
	# Add two string numbers
	def addition(self, str1, str2) :
		# Get the last location
		size1 = len(str1) - 1
		size2 = len(str2) - 1
		# Use to store the result
		result = ""
		num1 = 0
		num2 = 0
		carry = 0
		# Execute loop to get both string number 
		while (size1 >= 0 or size2 >= 0 or carry != 0) :
			num1 = 0
			num2 = 0
			if (size1 >= 0) :
				# Get the first number 
				num1 = ord(str1[size1]) - ord('0')
			
			if (size2 >= 0) :
				# Get the second number 
				num2 = ord(str2[size2]) - ord('0')
			
			carry = carry + num1 + num2
			# add sum into the result 
			result = str(carry % 10) + result
			if (carry != 0) :
				carry = int(carry / 10)
			
			# get next location
			# modified string text location
			size1 -= 1
			size2 -= 1
		
		return result
	
	# mutiply two string numbers
	# Assuming that given both strings is valid numbers
	def mutiply(self, str1, str2) :
		# Get the size of numeric string
		size1 = len(str1) - 1
		size2 = len(str2) - 1
		if (size1 < 0 or size2 < 0) :
			return
		
		# Use to store the result
		result = ""
		temp = ""
		zeros = ""
		# arithmetic operation variable
		num1 = 0
		num2 = 0
		carry = 0
		# Loop contolling variables
		i = 0
		k = 0
		num1_negative = 0
		num2_negative = 0
		if (str1[0] == '-') :
			num1_negative = 1
		
		if (str2[0] == '-') :
			num2_negative = 1
		
		i = size2
		while (i >= num2_negative) :
			k = size1
			temp = ""
			num1 = ord(str2[i]) - ord('0')
			# multiply num1 into another string elements
			while (k >= num1_negative or carry != 0) :
				if (k >= num1_negative) :
					# Get the second number 
					num2 = ord(str1[k]) - ord('0')
				else :
					num2 = 0
				
				carry = carry + (num1 * num2)
				# add last digit of carray
				temp = str(carry % 10) + temp
				if (carry != 0) :
					carry = int(carry / 10)
				
				# modified string text location
				k -= 1
			
			temp = temp + zeros
			result = self.addition(temp, result)
			zeros += "0"
			i -= 1
		
		if ((num1_negative == 1 and num2_negative == 0) or(num1_negative == 0 and num2_negative == 1)) :
			print("\n(", str1 ,") * (", str2 ,") = -", result, end = "")
		else :
			print("\n(", str1 ,") * (", str2 ,") = ", result, end = "")
		
	

def main() :
	obj = MyString()
	# Some test case
	obj.mutiply("14", "2")
	obj.mutiply("3", "9")
	# When one number is negative
	obj.mutiply("-14", "2")
	# When both number is negative
	obj.mutiply("-2", "-2")
	# When number is large
	obj.mutiply("7564353234554", "3233243424212128534124678")
	obj.mutiply("3233243424212128534124678", "7564353234554")

if __name__ == "__main__": main()

Output

( 14 ) * ( 2 ) =  28
( 3 ) * ( 9 ) =  27
( -14 ) * ( 2 ) = - 28
( -2 ) * ( -2 ) =  4
( 7564353234554 ) * ( 3233243424212128534124678 ) =  24457395354039465236143206596413723612
( 3233243424212128534124678 ) * ( 7564353234554 ) =  24457395354039465236143206596413723612
#  Ruby program
#  Multiply two string numbers
class MyString

	# Add two string numbers
	def addition(str1, str2)
	
		# Get the last location
		size1 = str1.length() - 1
		size2 = str2.length() - 1
		# Use to store the result
		result = ""
		num1 = 0
		num2 = 0
		carry = 0
		# Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		
			num1 = 0
			num2 = 0
			if (size1 >= 0)
			
				# Get the first number 
				num1 = (str1[size1]).ord - ('0').ord
			end
			if (size2 >= 0)
			
				# Get the second number 
				num2 = (str2[size2]).ord - ('0').ord
			end
			carry = carry + num1 + num2
			# add sum into the result 
			result = (carry % 10).to_s + result
			if (carry != 0)
			
				carry = carry / 10
			end
			# get next location
			# modified string text location
			size1 -= 1
			size2 -= 1
		end
		return result
	end
	# mutiply two string numbers
	# Assuming that given both strings is valid numbers
	def mutiply(str1, str2)
	
		# Get the size of numeric string
		size1 = str1.length() - 1
		size2 = str2.length() - 1
		if (size1 < 0 || size2 < 0)
		
			return
		end
		# Use to store the result
		result = ""
		temp = ""
		zeros = ""
		# arithmetic operation variable
		num1 = 0
		num2 = 0
		carry = 0
		# Loop contolling variables
		i = 0
		k = 0
		num1_negative = 0
		num2_negative = 0
		if (str1[0] == '-')
		
			num1_negative = 1
		end
		if (str2[0] == '-')
		
			num2_negative = 1
		end
		i = size2
		while (i >= num2_negative)
		
			k = size1
			temp = ""
			num1 = (str2[i]).ord - ('0').ord
			# multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			
				if (k >= num1_negative)
				
					# Get the second number 
					num2 = (str1[k]).ord - ('0').ord
				else
				
					num2 = 0
				end
				carry = carry + (num1 * num2)
				# add last digit of carray
				temp = (carry % 10).to_s + temp
				if (carry != 0)
				
					carry = carry / 10
				end
				# modified string text location
				k -= 1
			end
			temp = temp + zeros
			result = self.addition(temp, result)
			zeros += "0"
			i -= 1
		end
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		
			# When one number is nagative
			print("\n(", str1 ,") * (", str2 ,") = -", result)
		else
		
			print("\n(", str1 ,") * (", str2 ,") = ", result)
		end
	end
end
def main()

	obj = MyString.new()
	# Some test case
	obj.mutiply("14", "2")
	obj.mutiply("3", "9")
	# When one number is negative
	obj.mutiply("-14", "2")
	# When both number is negative
	obj.mutiply("-2", "-2")
	# When number is large
	obj.mutiply("7564353234554", "3233243424212128534124678")
	obj.mutiply("3233243424212128534124678", "7564353234554")
end
main()

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
// Scala program
// Multiply two string numbers
class MyString
{
	//Add two string numbers
	def addition(str1: String, str2: String): String = {
		//Get the last location
		var size1: Int = str1.length() - 1;
		var size2: Int = str2.length() - 1;
		//Use to store the result
		var result: String = "";
		var num1: Int = 0;
		var num2: Int = 0;
		var carry: Int = 0;
		//Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		{
			num1 = 0;
			num2 = 0;
			if (size1 >= 0)
			{
				//Get the first number 
				num1 = str1(size1) - '0';
			}
			if (size2 >= 0)
			{
				//Get the second number 
				num2 = str2(size2) - '0';
			}
			carry = carry + num1 + num2;
			//add sum into the result 
			result = ""+(carry % 10) + result;
			if (carry != 0)
			{
				carry = (carry / 10).toInt;
			}
			//get next location
			//modified string text location
			size1 -= 1;
			size2 -= 1;
		}
		return result;
	}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	def mutiply(str1: String, str2: String): Unit = {
		//Get the size of numeric string
		var size1: Int = str1.length() - 1;
		var size2: Int = str2.length() - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		var result: String = "";
		var temp: String = "";
		var zeros: String = "";
		//arithmetic operation variable
		var num1: Int = 0;
		var num2: Int = 0;
		var carry: Long = 0;
		//Loop contolling variables
		var i: Int = 0;
		var k: Int = 0;
		var num1_negative: Int = 0;
		var num2_negative: Int = 0;
		if (str1(0) == '-')
		{
			num1_negative = 1;
		}
		if (str2(0) == '-')
		{
			num2_negative = 1;
		}
		i = size2;
		while (i >= num2_negative)
		{
			k = size1;
			temp = "";
			num1 = str2(i) - '0';
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = str1(k) - '0';
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = ""+(carry % 10) + temp;
				if (carry != 0)
				{
					carry = (carry / 10).toInt;
				}
				//modified string text location
				k -= 1;
			}
			temp = temp + zeros;
			result = addition(temp, result);
			zeros += "0";
			i -= 1;
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			//When one number is nagative
			print("\n(" + str1 + ") * (" + str2 + ") = -" + result);
		}
		else
		{
			print("\n(" + str1 + ") * (" + str2 + ") = " + result);
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var obj: MyString = new MyString();
		//Some test case
		obj.mutiply("14", "2");
		obj.mutiply("3", "9");
		//When one number is negative
		obj.mutiply("-14", "2");
		//When both number is negative
		obj.mutiply("-2", "-2");
		//When number is large
		obj.mutiply("7564353234554", "3233243424212128534124678");
		obj.mutiply("3233243424212128534124678", "7564353234554");
	}
}

Output

(14) * (2) = 28
(3) * (9) = 27
(-14) * (2) = -28
(-2) * (-2) = 4
(7564353234554) * (3233243424212128534124678) = 24457395354039465236143206596413723612
(3233243424212128534124678) * (7564353234554) = 24457395354039465236143206596413723612
// Swift program
// Multiply two string numbers
class MyString
{
	//Add two string numbers
	func addition(_ text1: String, _ text2: String) -> String
	{   let str1 = Array(text1);
        let str2 = Array(text2);
		//Get the last location
		var size1: Int = str1.count - 1;
		var size2: Int = str2.count - 1;
		//Use to store the result
		var result: String = "";
		var num1: Int = 0;
		var num2: Int = 0;
		var carry: Int = 0;
		//Execute loop to get both string number 
		while (size1 >= 0 || size2 >= 0 || carry != 0)
		{
			num1 = 0;
			num2 = 0;
			if (size1 >= 0)
			{
				//Get the first number 
				num1 = Int(UnicodeScalar(String(str1[size1]))!.value  - UnicodeScalar("0")!.value);
			}
			if (size2 >= 0)
			{
				//Get the second number 
				num2 = Int(UnicodeScalar(String(str2[size2]))!.value  - UnicodeScalar("0")!.value);
			}
			carry = carry + num1 + num2;
			//add sum into the result 
			result = String(carry % 10) + result;
			if (carry != 0)
			{
				carry = carry / 10;
			}
			//get next location
			//modified string text location
			size1 -= 1;
			size2 -= 1;
		}
		return result;
	}
	//mutiply two string numbers
	//Assuming that given both strings is valid numbers
	func mutiply(_ text1: String, _ text2: String)
	{   let str1 = Array(text1);
        let str2 = Array(text2);
		//Get the size of numeric string
		let size1: Int = str1.count - 1;
		let size2: Int = str2.count - 1;
		if (size1 < 0 || size2 < 0)
		{
			return;
		}
		//Use to store the result
		var result: String = "";
		var temp: String = "";
		var zeros: String = "";
		//arithmetic operation variable
		var num1: Int = 0;
		var num2: Int = 0;
		var carry: Int = 0;
		//Loop contolling variables
		var i: Int = 0;
		var k: Int = 0;
		var num1_negative: Int = 0;
		var num2_negative: Int = 0;
		if (str1[0] == "-")
		{
			num1_negative = 1;
		}
		if (str2[0] == "-")
		{
			num2_negative = 1;
		}
		i = size2;
		while (i >= num2_negative)
		{
			k = size1;
			temp = "";
			num1 =  Int(UnicodeScalar(String(str2[i]))!.value  - UnicodeScalar("0")!.value);
			//multiply num1 into another string elements
			while (k >= num1_negative || carry != 0)
			{
				if (k >= num1_negative)
				{
					//Get the second number 
					num2 = Int(UnicodeScalar(String(str1[k]))!.value  - UnicodeScalar("0")!.value);
				}
				else
				{
					num2 = 0;
				}
				carry = carry + (num1 * num2);
				//add last digit of carray
				temp = String(carry % 10) + temp;
				if (carry != 0)
				{
					carry = carry / 10;
				}
				//modified string text location
				k -= 1;
			}
			temp = temp + zeros;
			result = self.addition(temp, result);
			zeros += "0";
			i -= 1;
		}
		if ((num1_negative == 1 && num2_negative == 0) || (num1_negative == 0 && num2_negative == 1))
		{
			print("\n(", text1 ,") * (", text2 ,") = -", result, terminator: "");
		}
		else
		{
			print("\n(", text1 ,") * (", text2 ,") = ", result, terminator: "");
		}
	}
}
func main()
{
	let obj: MyString = MyString();
	//Some test case
	obj.mutiply("14", "2");
	obj.mutiply("3", "9");
	//When one number is negative
	obj.mutiply("-14", "2");
	//When both number is negative
	obj.mutiply("-2", "-2");
	//When number is large
	obj.mutiply("7564353234554", "3233243424212128534124678");
	obj.mutiply("3233243424212128534124678", "7564353234554");
}
main();

Output

( 14 ) * ( 2 ) =  28
( 3 ) * ( 9 ) =  27
( -14 ) * ( 2 ) = - 28
( -2 ) * ( -2 ) =  4
( 7564353234554 ) * ( 3233243424212128534124678 ) =  24457395354039465236143206596413723612
( 3233243424212128534124678 ) * ( 7564353234554 ) =  24457395354039465236143206596413723612


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