Convert hexadecimal to octal number
Hexadecimal and octal are two different numbering systems, where hexadecimal uses a base of 16 (0-9, A-F) and octal uses a base of 8 (0-7). To convert a hexadecimal number to an octal number, you need to follow these steps:
Convert the hexadecimal number to binary by replacing each hexadecimal digit with its corresponding 4-bit binary value. For example, the hexadecimal number 2F8 would become 0010 1111 1000 in binary.
Group the binary digits into groups of 3 starting from the right. If the leftmost group has only 1 or 2 digits, add 0s to the left as necessary. For example, the binary number 0010 1111 1000 would be grouped as 001 011 111 000.
Convert each group of 3 binary digits to its corresponding octal digit. For example, the group 001 would become the octal digit 1, the group 011 would become the octal digit 3, the group 111 would become the octal digit 7, and the group 000 would become the octal digit 0.
Write the octal digits from left to right to form the octal equivalent of the original hexadecimal number. For example, the hexadecimal number 2F8 would be equivalent to the octal number 1370.
So, the process of converting hexadecimal to octal involves first converting the hexadecimal number to binary and then grouping the binary digits into groups of 3 and converting each group to its corresponding octal digit.
Program Solution
//C Program
//Convert hexadecimal to octal number
#include <stdio.h>
int power(int number,int size)
{
if(size==0)
{
return 1;
}
if(number == 0)
{
return 0;
}
else
{
int result=number;
for (int i = 2; i <= size; ++i)
{
result=result*number;
}
return result;
}
}
//Convert decimal number into octal
int octal(int number)
{
int result = 0;
int multiplier=1,remainder = 0;
while(number!=0)
{
remainder=number%8;
result=(remainder*multiplier)+result;
multiplier*=10;
number/=8;
}
return result;
}
void hexa_octal(char *hexa)
{
int decimal=0;
int digits=0;
int flag = 0;
int i = 0;
if(hexa[0]=='-')
{
flag = 1;
}
for (i = flag; hexa[i]!='\0'; ++i)
{
digits++;
}
//First convert hexadecimal to decimal number
for (i = flag; hexa[i]!='\0'; ++i,--digits)
{
if(hexa[i]>='0' && hexa[i]<='9')
{
//When hex digit, is a number
decimal+= (hexa[i]-48) * power(16,digits-1);
}
else if(hexa[i]>='a' && hexa[i]<='f')
{
// When of hexadecimal digit is an lowercase letter
decimal+= (hexa[i]-87) * power(16,digits-1);
}
else if(hexa[i]>='A' && hexa[i]<='F')
{
// When of hexadecimal digit is an uppercase letter
decimal+= (hexa[i]-55) * power(16,digits-1);
}
else
{
//invalid hexa decimal
return;
}
}
decimal=octal(decimal);
if(flag==1)
{
decimal = -decimal;
}
printf("Hexa : %s Octal : %d",hexa ,decimal);
printf("\n");
}
int main()
{
hexa_octal("A1");
hexa_octal("1A");
hexa_octal("f6");
hexa_octal("3E8");
hexa_octal("-E8");
return 0;
}Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350/*
Java Program
Convert hexadecimal to octal number
*/
public class MyNumber
{
public int power(int number, int size)
{
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
int result = number;
for (int i = 2; i <= size; ++i)
{
result = result *number;
}
return result;
}
}
//Convert decimal number into octal
public int octal(int number)
{
int result = 0;
int multiplier = 1, remainder = 0;
while (number != 0)
{
remainder = number % 8;
result = (remainder *multiplier) + result;
multiplier *= 10;
number /= 8;
}
return result;
}
public void hexa_octal(String hexa)
{
if (hexa.length() <= 0)
{
return;
}
int decimal = 0;
int digits = 0;
int flag = 0;
int i = 0;
if (hexa.charAt(i) == '-')
{
flag = 1;
}
for (i = flag; i < hexa.length(); ++i)
{
digits++;
}
//First convert hexadecimal to decimal number
for (i = flag; i < hexa.length(); ++i, --digits)
{
if (hexa.charAt(i) >= '0' && hexa.charAt(i) <= '9')
{
//When hex digit, is a number
decimal += (hexa.charAt(i) - 48) *power(16, digits - 1);
}
else if (hexa.charAt(i) >= 'a' && hexa.charAt(i) <= 'f')
{
// When of hexadecimal digit is an lowercase letter
decimal += (hexa.charAt(i) - 87) *power(16, digits - 1);
}
else if (hexa.charAt(i) >= 'A' && hexa.charAt(i) <= 'F')
{
// When of hexadecimal digit is an uppercase letter
decimal += (hexa.charAt(i) - 55) *power(16, digits - 1);
}
else
{
// Invalid hexa decimal
return;
}
}
digits = octal(decimal);
if (flag == 1)
{
digits = -digits;
}
System.out.print("Hexa : " + hexa + " Octal : " + digits);
System.out.print("\n");
}
public static void main(String[] args)
{
MyNumber obj = new MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
}
}Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350/*
C++ Program
Convert hexadecimal to octal number
*/
#include<iostream>
using namespace std;
class MyNumber
{
public: int power(int number, int size)
{
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
int result = number;
for (int i = 2; i <= size; ++i)
{
result = result *number;
}
return result;
}
}
//Convert decimal number into octal
int octal(int number)
{
int result = 0;
int multiplier = 1, remainder = 0;
while (number != 0)
{
remainder = number % 8;
result = (remainder *multiplier) + result;
multiplier *= 10;
number /= 8;
}
return result;
}
void hexa_octal(string hexa)
{
if (hexa.size() <= 0)
{
return;
}
int decimal = 0;
int digits = 0;
int flag = 0;
int i = 0;
if (hexa[i] == '-')
{
flag = 1;
}
for (i = flag; i < hexa.size(); ++i)
{
digits++;
}
//First convert hexadecimal to decimal number
for (i = flag; i < hexa.size(); ++i, --digits)
{
if (hexa[i] >= '0' && hexa[i] <= '9')
{
//When hex digit, is a number
decimal += (hexa[i] - 48) *this->power(16, digits - 1);
}
else if (hexa[i] >= 'a' && hexa[i] <= 'f')
{
// When of hexadecimal digit is an lowercase letter
decimal += (hexa[i] - 87) *this->power(16, digits - 1);
}
else if (hexa[i] >= 'A' && hexa[i] <= 'F')
{
// When of hexadecimal digit is an uppercase letter
decimal += (hexa[i] - 55) *this->power(16, digits - 1);
}
else
{
// Invalid hexa decimal
return;
}
}
digits = this->octal(decimal);
if (flag == 1)
{
digits = -digits;
}
cout << "Hexa : " << hexa << " Octal : " << digits;
cout << "\n";
}
};
int main()
{
MyNumber obj = MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
return 0;
}Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350/*
C# Program
Convert hexadecimal to octal number
*/
using System;
public class MyNumber
{
public int power(int number, int size)
{
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
int result = number;
for (int i = 2; i <= size; i++)
{
result = result * number;
}
return result;
}
}
//Convert decimal number into octal
public int octal(int number)
{
int result = 0;
int multiplier = 1, reMainder = 0;
while (number != 0)
{
reMainder = number % 8;
result = (reMainder * multiplier) + result;
multiplier *= 10;
number /= 8;
}
return result;
}
public void hexa_octal(String hexa)
{
if (hexa.Length <= 0)
{
return;
}
int decimals = 0;
int digits = 0;
int flag = 0;
int i = 0;
if (hexa[i] == '-')
{
flag = 1;
}
for (i = flag; i < hexa.Length; i++)
{
digits++;
}
//First convert hexadecimal to decimal number
for (i = flag; i < hexa.Length; i++, digits--)
{
if (hexa[i] >= '0' && hexa[i] <= '9')
{
//When hex digit, is a number
decimals += (hexa[i] - 48) * power(16, digits - 1);
}
else if (hexa[i] >= 'a' && hexa[i] <= 'f')
{
// When of hexadecimal digit is an lowercase letter
decimals += (hexa[i] - 87) * power(16, digits - 1);
}
else if (hexa[i] >= 'A' && hexa[i] <= 'F')
{
// When of hexadecimal digit is an uppercase letter
decimals += (hexa[i] - 55) * power(16, digits - 1);
}
else
{
// Invalid hexa decimal
return;
}
}
digits = octal(decimals);
if (flag == 1)
{
digits = -digits;
}
Console.Write("Hexa : " + hexa + " Octal : " + digits);
Console.Write("\n");
}
public static void Main(String[] args)
{
MyNumber obj = new MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
}
}Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350<?php
/*
Php Program
Convert hexadecimal to octal number
*/
class MyNumber
{
public function power($number, $size)
{
if ($size == 0)
{
return 1;
}
if ($number == 0)
{
return 0;
}
else
{
$result = $number;
for ($i = 2; $i <= $size; ++$i)
{
$result = $result *$number;
}
return $result;
}
}
//Convert decimal number into octal
public function octal($number)
{
$result = 0;
$multiplier = 1;
$remainder = 0;
while ($number != 0)
{
$remainder = $number % 8;
$result = ($remainder *$multiplier) + $result;
$multiplier *= 10;
$number = intval($number / 8);
}
return $result;
}
public function hexa_octal($hexa)
{
if (strlen($hexa) <= 0)
{
return;
}
$decimal = 0;
$digits = 0;
$flag = 0;
$i = 0;
if ($hexa[$i] == '-')
{
$flag = 1;
}
for ($i = $flag; $i < strlen($hexa); ++$i)
{
$digits++;
}
//First convert hexadecimal to decimal number
for ($i = $flag; $i < strlen($hexa); ++$i, --$digits)
{
if (ord($hexa[$i]) >= ord('0') && ord($hexa[$i]) <= ord('9'))
{
//When hex digit, is a number
$decimal += (ord($hexa[$i]) - 48) *$this->power(16, $digits - 1);
}
else if (ord($hexa[$i]) >= ord('a') && ord($hexa[$i]) <= ord('f'))
{
// When of hexadecimal digit is an lowercase letter
$decimal += (ord($hexa[$i]) - 87) *$this->power(16, $digits - 1);
}
else if (ord($hexa[$i]) >= ord('A') && ord($hexa[$i]) <= ord('F'))
{
// When of hexadecimal digit is an uppercase letter
$decimal += (ord($hexa[$i]) - 55) *$this->power(16, $digits - 1);
}
else
{
return;
}
}
$digits = $this->octal($decimal);
if ($flag == 1)
{
$digits = -$digits;
}
echo("Hexa : ". $hexa ." Octal : ". $digits);
echo("\n");
}
}
function main()
{
$obj = new MyNumber();
//Test Case
$obj->hexa_octal("A1");
$obj->hexa_octal("1A");
$obj->hexa_octal("f6");
$obj->hexa_octal("3E8");
$obj->hexa_octal("-E8");
}
main();Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350/*
Node Js Program
Convert hexadecimal to octal number
*/
class MyNumber
{
power(number, size)
{
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
var result = number;
for (var i = 2; i <= size; ++i)
{
result = result *number;
}
return result;
}
}
//Convert decimal number into octal
octal(number)
{
var result = 0;
var multiplier = 1;
var remainder = 0;
while (number != 0)
{
remainder = number % 8;
result = (remainder *multiplier) + result;
multiplier *= 10;
number = parseInt(number / 8);
}
return result;
}
hexa_octal(hexa)
{
if (hexa.length <= 0)
{
return;
}
var decimal = 0;
var digits = 0;
var flag = 0;
var i = 0;
if (hexa[i] == '-')
{
flag = 1;
}
for (i = flag; i < hexa.length; ++i)
{
digits++;
}
//First convert hexadecimal to decimal number
for (i = flag; i < hexa.length; ++i, --digits)
{
if ((hexa[i]).charCodeAt(0) >= ('0').charCodeAt(0) && (hexa[i]).charCodeAt(0) <= ('9').charCodeAt(0))
{
//When hex digit, is a number
decimal += ((hexa[i]).charCodeAt(0) - 48) *this.power(16, digits - 1);
}
else if ((hexa[i]).charCodeAt(0) >= ('a').charCodeAt(0) && (hexa[i]).charCodeAt(0) <= ('f').charCodeAt(0))
{
// When of hexadecimal digit is an lowercase letter
decimal += ((hexa[i]).charCodeAt(0) - 87) *this.power(16, digits - 1);
}
else if ((hexa[i]).charCodeAt(0) >= ('A').charCodeAt(0) && (hexa[i]).charCodeAt(0) <= ('F').charCodeAt(0))
{
// When of hexadecimal digit is an uppercase letter
decimal += ((hexa[i]).charCodeAt(0) - 55) *this.power(16, digits - 1);
}
else
{
return;
}
}
digits = this.octal(decimal);
if (flag == 1)
{
digits = -digits;
}
process.stdout.write("Hexa : " + hexa + " Octal : " + digits);
process.stdout.write("\n");
}
}
function main(args)
{
var obj = new MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
}
main();Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350# Python 3 Program
# Convert hexadecimal to octal number
class MyNumber :
def power(self, number, size) :
if (size == 0) :
return 1
if (number == 0) :
return 0
else :
result = number
i = 2
while (i <= size) :
result = result * number
i += 1
return result
# Convert decimal number into octal
def octal(self, number) :
result = 0
multiplier = 1
remainder = 0
while (number != 0) :
remainder = number % 8
result = (remainder * multiplier) + result
multiplier *= 10
number = int(number / 8)
return result
def hexa_octal(self, hexa) :
if (len(hexa) <= 0) :
return
decimal = 0
digits = 0
flag = 0
i = 0
if (hexa[i] == '-') :
flag = 1
i = flag
while (i < len(hexa)) :
digits += 1
i += 1
# First convert hexadecimal to decimal number
i = flag
while (i < len(hexa)) :
if (ord(hexa[i]) >= ord('0') and ord(hexa[i]) <= ord('9')) :
# When hex digit, is a number
decimal += (ord(hexa[i]) - 48) * self.power(16, digits - 1)
elif (ord(hexa[i]) >= ord('a') and ord(hexa[i]) <= ord('f')) :
# When of hexadecimal digit is an lowercase letter
decimal += (ord(hexa[i]) - 87) * self.power(16, digits - 1)
elif (ord(hexa[i]) >= ord('A') and ord(hexa[i]) <= ord('F')) :
# When of hexadecimal digit is an uppercase letter
decimal += (ord(hexa[i]) - 55) * self.power(16, digits - 1)
else :
return
i += 1
digits -= 1
digits = self.octal(decimal)
if (flag == 1) :
digits = -digits
print("Hexa : ", hexa ," Octal : ", digits, end = "")
print("\n", end = "")
def main() :
obj = MyNumber()
# Test Case
obj.hexa_octal("A1")
obj.hexa_octal("1A")
obj.hexa_octal("f6")
obj.hexa_octal("3E8")
obj.hexa_octal("-E8")
if __name__ == "__main__": main()Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350# Ruby Program
# Convert hexadecimal to octal number
class MyNumber
def power(number, size)
if (size == 0)
return 1
end
if (number == 0)
return 0
else
result = number
i = 2
while (i <= size)
result = result * number
i += 1
end
return result
end
end
# Convert decimal number into octal
def octal(number)
result = 0
multiplier = 1
remainder = 0
while (number != 0)
remainder = number % 8
result = (remainder * multiplier) + result
multiplier *= 10
number /= 8
end
return result
end
def hexa_octal(hexa)
if (hexa.length() <= 0)
return
end
decimal = 0
digits = 0
flag = 0
i = 0
if (hexa[i] == '-')
flag = 1
end
i = flag
while (i < hexa.length())
digits += 1
i += 1
end
# First convert hexadecimal to decimal number
i = flag
while (i < hexa.length())
if ((hexa[i]).ord >= ('0').ord && (hexa[i]).ord <= ('9').ord)
# When hex digit, is a number
decimal += ((hexa[i]).ord - 48) * self.power(16, digits - 1)
elsif ((hexa[i]).ord >= ('a').ord && (hexa[i]).ord <= ('f').ord)
# When of hexadecimal digit is an lowercase letter
decimal += ((hexa[i]).ord - 87) * self.power(16, digits - 1)
elsif ((hexa[i]).ord >= ('A').ord && (hexa[i]).ord <= ('F').ord)
# When of hexadecimal digit is an uppercase letter
decimal += ((hexa[i]).ord - 55) * self.power(16, digits - 1)
else
return
end
i += 1
digits -= 1
end
digits = self.octal(decimal)
if (flag == 1)
digits = -digits
end
print("Hexa : ", hexa ," Octal : ", digits)
print("\n")
end
end
def main()
obj = MyNumber.new()
# Test Case
obj.hexa_octal("A1")
obj.hexa_octal("1A")
obj.hexa_octal("f6")
obj.hexa_octal("3E8")
obj.hexa_octal("-E8")
end
main()Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350
/*
Scala Program
Convert hexadecimal to octal number
*/
class MyNumber
{
def power(number: Int, size: Int): Int = {
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
var result: Int = number;
var i: Int = 2;
while (i <= size)
{
result = result * number;
i += 1;
}
return result;
}
}
//Convert decimal number into octal
def octal(num: Int): Int = {
var result: Int = 0;
var multiplier: Int = 1;
var remainder: Int = 0;
var number: Int = num;
while (number != 0)
{
remainder = number % 8;
result = (remainder * multiplier) + result;
multiplier *= 10;
number = (number / 8).toInt;
}
return result;
}
def hexa_octal(hexa: String): Unit = {
if (hexa.length() <= 0)
{
return;
}
var decimal: Int = 0;
var digits: Int = 0;
var flag: Int = 0;
var i: Int = 0;
if (hexa(i) == '-')
{
flag = 1;
}
i = flag;
while (i < hexa.length())
{
digits += 1;
i += 1;
}
//First convert hexadecimal to decimal number
i = flag;
while (i < hexa.length())
{
if (hexa(i) >= '0' && hexa(i) <= '9')
{
//When hex digit, is a number
decimal += (hexa(i) - 48) * power(16, digits - 1);
}
else if (hexa(i) >= 'a' && hexa(i) <= 'f')
{
// When of hexadecimal digit is an lowercase letter
decimal += (hexa(i) - 87) * power(16, digits - 1);
}
else if (hexa(i) >= 'A' && hexa(i) <= 'F')
{
// When of hexadecimal digit is an uppercase letter
decimal += (hexa(i) - 55) * power(16, digits - 1);
}
else
{
return;
}
i += 1;
digits -= 1;
}
digits = octal(decimal);
if (flag == 1)
{
digits = -digits;
}
print("Hexa : " + hexa + " Octal : " + digits);
print("\n");
}
}
object Main
{
def main(args: Array[String]): Unit = {
var obj: MyNumber = new MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
}
}Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350/*
Swift Program
Convert hexadecimal to octal number
*/
class MyNumber
{
func power(_ number: Int, _ size: Int) -> Int
{
if (size == 0)
{
return 1;
}
if (number == 0)
{
return 0;
}
else
{
var result: Int = number;
var i: Int = 2;
while (i <= size)
{
result = result * number;
i += 1;
}
return result;
}
}
//Convert decimal number into octal
func octal(_ num: Int) -> Int
{
var result: Int = 0;
var multiplier: Int = 1;
var remainder: Int = 0;
var number : Int = num;
while (number != 0)
{
remainder = number % 8;
result = (remainder * multiplier) + result;
multiplier *= 10;
number /= 8;
}
return result;
}
func hexa_octal(_ data: String)
{
var hexa = Array(data)
if (hexa.count <= 0)
{
return;
}
var decimal: Int = 0;
var digits: Int = 0;
var flag: Int = 0;
var i: Int = 0;
if (hexa[i] == "-")
{
flag = 1;
}
i = flag;
while (i < hexa.count)
{
digits += 1;
i += 1;
}
//First convert hexadecimal to decimal number
i = flag;
while (i < hexa.count)
{
if (hexa[i] >= "0" && hexa[i] <= "9")
{
//When hex digit, is a number
decimal += (Int(UnicodeScalar(String(hexa[i]))!.value) - 48) * self.power(16, digits - 1);
}
else if (hexa[i] >= "a" && hexa[i] <= "f")
{
// When of hexadecimal digit is an lowercase letter
decimal += (Int(UnicodeScalar(String(hexa[i]))!.value) - 87) * self.power(16, digits - 1);
}
else if (hexa[i] >= "A" && hexa[i] <= "F")
{
// When of hexadecimal digit is an uppercase letter
decimal += (Int(UnicodeScalar(String(hexa[i]))!.value) - 55) * self.power(16, digits - 1);
}
else
{
return;
}
i += 1;
digits -= 1;
}
digits = self.octal(decimal);
if (flag == 1)
{
digits = -digits;
}
print("Hexa : ", data ," Octal : ", digits, terminator: "");
print("\n", terminator: "");
}
}
func main()
{
let obj: MyNumber = MyNumber();
//Test Case
obj.hexa_octal("A1");
obj.hexa_octal("1A");
obj.hexa_octal("f6");
obj.hexa_octal("3E8");
obj.hexa_octal("-E8");
}
main();Output
Hexa : A1 Octal : 241
Hexa : 1A Octal : 32
Hexa : f6 Octal : 366
Hexa : 3E8 Octal : 1750
Hexa : -E8 Octal : -350
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