switch

The switch statement is a multi-select control structure. An expression is evaluated once and compared to 'constants'. In case of equality, the 'statements' that come after the 'constant' are processed. In switch 'statements' can only ordinary data types (ie, 'int', 'long', char, short, etc.) can be used.

switch(expression)
{
   case constant1:
       statements
   break;
 
   case constant2:
       statements
   break;
 
   case constantn:
       statements
   break;
 
   default:
       statements
} 

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
 int input;
 
    do
    {
        printf( "press 1 or 2 \n" );
        scanf( "%d", &input );
        switch ( input ) 
        {
            case 1:
                printf("case 1 selected\n");
                break;
            case 2:          
                printf("case 2 selected\n");
                break;
            default:            
                printf( "default case!\n" );
                break;
        }
    }
    while(input != 2);
 
return 0;
}

  press 1 or 2 
  1
  case 1 selected
  press 1 or 2 
  2
  case 2 selected