1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    char mask = 1;
        mask = mask << pos;
        if (mode == 1)  {

            reg = reg | mask;
        }
        else {
            mask = ~mask;
            reg = reg & mask;
        }
    return reg;
}

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