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) {
        // Set bit number pos
        // 10 - 1010, pos - 3
        // unsigned char mask = 1 << pos; // 1 at pos
        reg = reg | (1 << pos);

        return reg;
    } else {    
        // Clear bit number pos
        // 10 - 1010, pos - 3
        // unsigned char mask // 0 at pos
        reg = reg ^ (1 << 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;
}