Switch statement examples

/* Example for a switch statement */
/* Uses an integer value for choice. Note what happens if the breaks
   are removed.
*/


#include <stdio.h>

int main(void)
{
  int choice;

  printf("\nEnter 1, 2, 3 . Enter a 4 to quit ");
  scanf("%d", &choice);
  switch(choice)
  {
    case 1: printf("\nyou entered one \n");
    case 2: printf("\nyou entered two \n");
    case 3: printf("\nyou entered three \n");
    case 4: printf("\nyou asked to quit\n");
    default: printf("\nyou entered an invalid number\n");
  } 

  return (0);
}

OUTPUT from multiple runs of the program:

Enter 1, 2, 3 . Enter a 4 to quit 1
you entered one
you entered two
you entered three
you asked to quit
you entered an invalid number

Enter 1, 2, 3 . Enter a 4 to quit 3
you entered three
you asked to quit
you entered an invalid number

Enter 1, 2, 3 . Enter a 4 to quit 4
you asked to quit
you entered an invalid number


/* Example for a switch statement */
/* Uses an integer value for choice. Note what happens with the addition
   of the breaks
*/


#include <stdio.h>

int main(void)
{
  int choice;

  printf("\nEnter 1, 2, 3 . Enter a 4 to quit ");
  scanf("%d", &choice);
  switch(choice)
  {
    case 1: printf("\nyou entered one \n"); break;
    case 2: printf("\nyou entered two \n"); break;
    case 3: printf("\nyou entered three \n"); break;
    case 4: printf("\nyou asked to quit\n"); break;
    default: printf("\nyou entered an invalid number\n");
  } 
  
  return (0);
}

OUTPUT from multiple runs

Enter 1, 2, 3 . Enter a 4 to quit 1
you entered one 

Enter 1, 2, 3 . Enter a 4 to quit 3
you entered three

Enter 1, 2, 3 . Enter a 4 to quit 4
you asked to quit

Enter 1, 2, 3 . Enter a 4 to quit 9
you entered an invalid number


/* Example for a switch statement */
/* Uses a char value for choice. Note how the breaks are used in this
   example. Also note the readability of this example vs. that of the 
   previous ones.
*/


#include <stdio.h>

int main(void)
{
  char choice;

  printf("\nEnter a, b, c. Enter a q to quit ");
  scanf(" %c", &choice);
  switch(choice)
  {
    case 'A':
    case 'a': printf("\nyou entered A\n"); 
              break;
    case 'B':
    case 'b': printf("\nyou entered B\n");
              break;
    case 'C':
    case 'c': printf("\nyou entered C\n");
              break;
    case 'Q':
    case 'q': printf("\nyou asked to quit\n");
              break;
    default: printf("\nyou entered an invalid character\n");
  } 

  return (0);
}