1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {

    if (mode == 0)
    {
        // Clear bit at bit_position = pos;

        unsigned char mask = (1 << pos);
        reg &= ~mask;
        return reg;
    } else if (mode == 1)
    {
        // Set bit at bit_position = pos;

        unsigned char mask = (1 << pos);
        reg |= mask;
        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;
}