Set or Clear a Specific Bit in a Register

Code

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    int arr[8] = {0,0,0,0,0,0,0,0};
    int pow_of_2[8] = {1,2,4,8,16,32,64};
    int x = 8;
    unsigned char answer = 0;
    while(reg > 0) 
    {
        arr[x] = reg % 2;
        reg = reg / 2;
        x--;
    }
    arr[8-pos] = mode;

    int y = 8;
    int z = 0;
    while(y > 0)
    {
        answer += (arr[y]*pow_of_2[z]);
        y--;
        z++;
    }
    return answer;
}

int main() {
    unsigned char reg;
    int pos;
    int mode;
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}

Solving Approach