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
    if (mode == 1) {
        return reg | (1 << pos);
    }
    else if (mode == 0) {
        // 255 xor left-shifted 1
        // 11111111 ^
        // 00001000 =
        // 11110111
        int targeted_filter = 255 ^ (1 << pos);
        return reg & targeted_filter;
    }
}

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