1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

#define SET_BIT     1
#define UNSET_BIT   0

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    if (mode == SET_BIT)
    {
        return reg | (1 << pos);
    }
    else if (mode == UNSET_BIT)
    {
        return reg & ~(1 << pos);
    }
    return 0;
}

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