2. Bit Toggle

#include <stdio.h>

int toggleFifthBit(int n) {
    // Write your code here
    return n ^= (1<<5);
}

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

Simple
0^1 = 1
1^1 = 0

Do 5th position XOR with 1 to invert bit