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
    int bit = (reg >> pos) & 1;
    if(mode == 0) {
         if(bit){
            reg &= ~(1 << pos);
         }
    }
    else
    {
         if(!bit){
            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;
}

Tried checking if given bit to be modified is set or clear bit.

If mode is 0 and pos bit is set, cleared the pos bit.

If mode is 1 and pos bit is clear, set the pos bit.