Bit Toggle

Code

#include <stdio.h>

int toggleFifthBit(int n) {
    // find out if the 5th bit is a 1 or 0
    int fifth_mask = 1 << 5;
    if (n & fifth_mask)
    {
        // we know that the 5th bit is a 1
        n &= (~fifth_mask);
    }
    else
    {
        n |= fifth_mask;
    }
    return n;
}

int main() {
    int n;
    scanf("%d", &n);
    printf("%d", toggleFifthBit(n));
    return 0;
}

Solving Approach