The switch statement : Switch statement « Statement « C Tutorial






  1. C Tutorial
  2. Statement
  3. Switch statement

To take one of a number of possible actions.

switch is preferred over multiple if...else statements.

The general form of a switch statement is

switch(switch_expr)
     {
       case constant expr1 :  S1;
                              S2;
                              break;
       case constant expr1 :  S3;
                              S4;
                              break;
       .....
       default             :  S5;
                              S6;
                              break;
     }

The clause 'default' is optional.

#include <stdio.h>

main(){
    int i,n = 5;
   
   
    for(i = 1; i<n; i= i+1){
        switch(i%2)
        {
            case 0 : printf("the number %d is even \n",i);
                     break;
            case 1 : printf("the number %d is odd \n",i);
                     break;
        }
    }
}

the number 1 is odd
     the number 2 is even
     the number 3 is odd
     the number 4 is even




6.4.Switch statement
6.4.1.The switch statement
6.4.2.In the absence of a break statement, all statements that are followed by matched cases are executed.
6.4.3.break statement stops evaluating any further case statements.
6.4.4.Confused if statement
6.4.5.Use switch to simplify the logic
6.4.6.Two cases, one action
6.4.7.Nest if statement in case statement
6.4.8.Use the switch structure to evaluate a user's response from a menu (without break).
6.4.9.Use switch structure to evaluate characters