1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

#define MASK(pos) (((1U<<1)-1U) << pos)
unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    if (mode){
        reg |= MASK(pos);
    }
    else{
        reg &= ~(MASK(pos));

    }
    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;
}