# Conversion from binary to octal in swift

Swift program for Conversion from binary to octal. Here mentioned other language solution.

``````import Foundation
//  Swift program for
//  Convert Binary number into Octal number
class Convert
{
// Convert decimal number into octal
func octal(_ num : Int) -> Int
{
var number = num;
var result : Int = 0;
var multiplier : Int = 1;
var remainder : Int = 0;
while (number != 0)
{
remainder = number % 8;
result = (remainder * multiplier) + result;
multiplier *= 10;
number = number / 8;
}
return result;
}
func binaryToOctal(_ num : String)
{
if (num.count == 0)
{
// When empty binary number
return;
}
// Some useful variable
var flag : Bool = false;
var decimalNo : Int = 0;
var counter : Int = 0;
var index : Int = num.count - 1;
// We Assume that given binary number is valid
// Here - indicates negative binary number
// First convert binary to decimal
// Example = 10111 => 23
while (index >= 0)
{
if (Array(num)[index] == "1")
{
decimalNo += (1 << counter);
}
else
if (Array(num)[index] != "0")
{
if (index == 0 && Array(num)[index] == "-")
{
// When get negative number
flag = true;
}
else
{
// Not a valid binary number
return;
}
}
counter += 1;
index -= 1;
}
// When given number is
var output : Int = self.octal(decimalNo);
if (flag == true)
{
output = -output;
}
// Display given number
print("Binary : " + num,terminator: "");
// Display result
print(" Octal : " + String(output));
}
}
let task : Convert = Convert();
// Test Case

Output

``````Binary : 1111 Octal : 17
Binary : 10111 Octal : 27
Binary : 101011 Octal : 53
Binary : 11011 Octal : 33
Binary : -1000110 Octal : -106``````

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