3. Check if K-th Bit is Set

#include <stdio.h>

int isKthBitSet(int n, int k) {
    return n & (1<<k) != 0;
}

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

Anding the bit with 1 and everything as 0 will show if the bit is set