1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

int modifyBit(int reg, int pos, int mode);

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