Switch…case: C Program

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 This program is about Switch…case statement.
Decision making are needed when, the program encounters the situation to choose a particular statement among many statements. If a programmer has to choose one block of statement among many alternatives, nested if…else can be used but, this makes programming logic complex. This type of problem can be handled in C programming using switch statement.

[message_box title=”Syntax of switch…case” color=”red”]

switch (n) {
case constant1:
   code/s to be executed if n equals to constant1;
   break;
case constant2:
   code/s to be executed if n equals to constant2;
   break;
   .
   .
   . 
default:
   code/s to be executed if n doesn't match to any cases;
}
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The value of n is either an integer or a character in above syntax. If the value of n matches constant in case, the relevant codes are executed and control moves out of the switch statement. If the doesn’t matches any of the constant in case, then the default codes are executed and control moves out of switch statement.

switch case[message_box title=”Program” color=”red”]

/* Write a program that reads a number from 1 to 7 and accordingly it

should display Sunday to Saturday */

/* Written by Utpal Chaudhary */

#include<stdio.h>
#include<conio.h>
void main()
{
int day;
clrscr();
printf(“Enter day number : “);
scanf(“%d”,&day);
switch(day)
{
case 1:
printf(“Sunday is the first day of the week”);
break;
case 2:
printf(“Monday is the second day of the week”);
break;
case 3:
printf(“Tuesday is the third day of the week”);
break;
case 4:
printf(“Wednesday is the fourth day of the week”);
break;
case 5:
printf(“Thursday is the fifthe day of the week”);
break;
case 6:
printf(“Friday is the sixth day of the week”);
break;
case 7:
printf(“Saturday is the seventh day of the week”);
break;
default:
printf(“You have entered a wrong choice”);
}
getch();
}

[/message_box] [message_box title=”Output” color=”red”]

Enter day Number:3

Tuesday is the third day of the week

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