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)
    {
        //set bit at pos "pos"
        reg = 1<<pos | reg;
    }
    else
    {
         //clear bit at pos "pos"
        reg = ~(1 <<pos) & reg;
    }
    return reg;
}

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