1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

enum {
    BIT_CLEAR_MODE,
    BIT_SET_MODE,
    BIT_NONE_MODE,
};

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