Check if K-th Bit is Set

Code

#include <stdio.h>

int isKthBitSet(int n, int k) {
    if(n &= (1<<k)){    //Case : SET
        return 1;
    }
    else if(!(n &= (1<<k))){    //Case : NOT
        return 0;
    }
    else{       //Case : Error
        return -1;
    }
}

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

Solving Approach