1. Set or Clear a Specific Bit in a Register

#include <stdio.h>


int main() {
    unsigned char reg;
    int pos, mode;
    scanf("%d %d %d", &reg, &pos, &mode);
    if(mode==1)
    {
        reg |=(1<<pos);
    }
    else
    {
       reg &=~(1<<pos); 
    }
    printf("%d",reg);
    return 0;
}