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
    unsigned char m_reg;
    m_reg = (unsigned char)reg;
    if(mode){
        m_reg |= (0xFF & 1<<pos);
    } else{
        m_reg &= ~(1<<pos);
    }
    return (unsigned char)m_reg;
}

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