1. Set or Clear a Specific Bit in a Register

#include <stdio.h>
#include<math.h>
int modifyBit(int reg, int pos, int mode) {
   if(mode==1){
    return(reg |((int)pow(2,pos)));
   }
   else{
    return(reg&(~((int)pow(2,pos))));
   }
}

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