switch case in C

 What is switch case:-

                                  Switch case is a decision making construct which provide multiway alternative based on the selective expression . It has following syntax.

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switch(expression )

{

      case label 1:  // statement if expr matches to the label 1

                           break;

      case label 2: // statement if expr matches to the label 2

                           break; 

       .

       .

       .

       .

      case label n: // statement if expr matches to the label n

                           break;

      default : // statement if expression does not matches with any label's

}

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Expression:-   Expression is combination of operands and operators.

Working of switch case:-

1. First of all expression is calculated.
2. The result of the expression is matches with labels one by one (label 1,label 2,label 3 up to label n).
3. If the result of the expression is matches with 'label i'  than the statement corresponding to the label i will be executed. If a break statement is encountered then flow of control goes outside of the switch block and continue to execute next statement after switch block.

     Note:-  if the value of the expression does not matches to any of the label the statement written under the default section will be executed . Default is optional in switch construct .

Example:-  Write a program to display a food menu to the user .  

  

#include<stdio.h>

int main()

{

int ch;

printf("1. Tea\n");

printf("2. Samosa\n");

printf("3. Cake\n");

printf("Enter your choice \n");

scanf("%d",&ch);

switch(ch)

{

case 1: printf("OK , You will get tea\n ");

break;

case 2 : printf("OK , You will get samosa\n");

break;

case 3: printf("OK , You will get cake\n");

break;

default: printf("You entered wrong choice\n");

}

return 0;

}    

Output:-

1. Tea

2. Samosa

3. Cake

Enter your choice

1

OK , You will get tea

Practice question based on switch case :-   Click here

<<Pre - Practice problems on if and else              Next - Practice problems on switch case>>

    

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