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
    int pos_num = 1;
    
    for (int i = 0; i < pos; i++){
        pos_num = 2*pos_num;
    }

    if (mode == 1) return (reg | pos_num);
    else if (mode == 0) return (reg & (~pos_num));
    else return -1;
}

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