Question

How to implement binary subtraction in C

Answer 1

#include <stdio.h>

int BinaryAddition(int a, int b) {
    int carry;

    while (b != 0) {
        carry = (a & b) << 1;
        a = a ^ b;
        b = carry;
    }

    return a;
}

int BinarySubtraction(int a, int b) {
    int carry;
    
    b = BinaryAddition(~b, 1);

    while (b != 0) {
        carry = (a & b) << 1;
        a = a ^ b;
        b = carry;
    }

    return a;
}


int main()
{
    int number1 = 8, number2 = 3;

    printf("%d", BinarySubtraction(number1, number2));
 
    return 0;
}



/*
run:

5

*/

 

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