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
    switch (mode) {
    case 1:
        // Code if mode == set
        reg |= (1U << (pos % 8));
        break;
    case 0:
        // Code if mode == clear
        reg &= ~(1U << (pos % 8));
        break;
    default:
        // Code if no case matches
        break;
    }

    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;
}