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(pos < 0 || pos>8)
    {
        return reg;
    }
    unsigned char mask = 1;
        mask = mask << (pos);
    switch(mode)
    {
        case 0:
        {
            reg &= (~mask);
            // printf("%d",reg);
            break;
        }
        case 1:
        {
            reg |= mask;
            // printf("%d",reg);
            break;
        }
        default :
        break;

    }
    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;
}