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==0)// clear mode
    {
       int a = ~(1<<pos);
       int d = reg & (a);
       return d;
    }
    else // set mode
    {
        int a = 1<<pos;
        int d = reg | a;
        return d;
    }
    return 0;

}

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