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We are in a position to write some programs using switch statements now.
Example
 1: Write a C program to check whether a supposed vowel read from the keyboard

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is  a  vowel.  Use  switch  statements  only.  Now  rewrite  this  program  with  mixed  integer  and
character constants. Will the program compile?
Solution 1:
 We write two separate programs—one with integer constants in case and the other
with both integer and character constants.
//vowel program using switch with character constants only (in case)
    #include
    void main( )
     {
       char ch;
       printf(“\n Enter any vowel:”);
        scanf(“%c”, ch);
        switch (ch)
         {
            case ‘a’:
                   printf(“You entered a.”);
                   break;
            case ‘e’:
                   printf(“You entered e.”);
                   break;
            case ‘i’:
                   printf(“You entered i.”);
                   break;
            case ‘o’:
                   printf(“You entered o.”);
                   break;
            case ‘u’:
                   printf(“You entered u.”);
                   break;
            default:
                printf(“You have not entered any vowel.”);
          }
        }