Switch Case in C

The switch case is a good decision making statement in C language , as if statement has very much complexity in its structure and its difficult to handle multiple decision in with if..else .

• The function of switch statement is to read the variable associated with it as (switch(variable)) and then it check the list of case , the value which matches ,with the case the function or statement associated with it is executed.

Structure of switch-case

variable;

switch (variable)

{

       case value-1:

      lines to be executed-1;

      break;

      case value-2:

      lines to be executed-1;

      break;

}

statements to be executed;

        Look friends in this above switch-case statements , the value-1 , value-2 are the title of the case

when any user type this title or value the corresponding lines associated with the case are executed respectively.

• So remember friends when in above structure if you type value-1 then“lines to be executed-1;” this particular line will be executed and program will run further and it will return to “statements to be executed;” statement in program
• Always remember that break function is necessary because if don,t use it your program will execute but suppose if you choose some value then all above values will be executed , and all line,s associated with it will be printed in program .

Example

#include<stdio.h>

#include<conio.h>

void main()

{

int day ; //day is variable which stores input integer value from user

clrscr();

printf("\nenter the number and u will know the day\n\n ");

scanf("%d",&day);

switch(day)

{

   case 1:

      printf("MONDAY");

   break;

   case 2:

      printf("TUESDAY");

   break;

   case 3:

      printf("WEDNESDAY");

   break;

   case 4:

      printf("THURSDAY");

   break;

   case 5:

      printf("FRIDAY");

   break;

   case 6:

      printf("SATURDAY");

   break;

   case 7:

      printf("SUNDAY");

   break;

}

getch();

}