C MMi 구조 switch case

#include <stdio.h>

// Needed for exit()
#include <stdlib.h>

void main(void){
int whatToDo = 0;

do{
printf("\n");
printf("1. What time is it?\n");
printf("2. What is todays data?\n");
printf("3. What day is it?\n");
printf("4. Quit\n");

scanf(" %d", &whatToDo);
}while(whatToDo < 1 || whatToDo > 4);
switch(whatToDo){

case(1) : printf("print the time");
  break;
case(2) : printf("Print the date");
  break;
case(3) : printf("Print the day");
  break;
default : printf("Bye Bye");
  exit(0);
  break; 

}