switch,case,default statement in C tutorials

The switch statement is a multi-way decision-making construct that tests wheather an expression matches one of a number of constant values and branches accordingly.
The switch statement is a neater alternative to using else-if statements where multi-way decision making is involved.
The expression must be enclosed in parentheses, and the body of the switch statement must be enclosed in braces.
Statements can be single or multiple statements with or without braces.
The values with case should be constants.The expression is evaluted and the resultant value is compared with each of the values given with case.
If any of the values match,the statements following the case, till break, are executed.
If none of the case values match the result of expression , then the statements following default,which is optional, are executed.
The keyword break is used to delimit the scope of the statemants under a particular case.

The program decides if a letter entered as input is a vowel or not.
The program starts with defining a character variable called ch. The value of ch is accepted as input
The next statement switch(ch) checks that letter entered is vowel or not by checking that letter entered is �a�,�A�,�e�,�E�,�i�,�I�,�o�,�O�,�u�,�U� or not.
If alphabet entered is a vowel then statements, will print it is a vowel message, and break statement will transfer control out of switch block.
If user enter any character other than vowel, it will execute default message, enter character is not vowel.

C Programming.

switch,case,default statement in C tutorials

The switch statement is a multi-way decision-making construct that tests wheather an expression matches one of a number of constant values and branches accordingly.

The switch statement is a neater alternative to using else-if statements where multi-way decision making is involved.

The expression must be enclosed in parentheses, and the body of the switch statement must be enclosed in braces.

Statements can be single or multiple statements with or without braces.

The values with case should be constants.The expression is evaluted and the resultant value is compared with each of the values given with case.

If any of the values match,the statements following the case, till break, are executed.

If none of the case values match the result of expression , then the statements following default,which is optional, are executed.

The keyword break is used to delimit the scope of the statemants under a particular case.

Syntax:

switch(expression)

{

case value 1:

statements ;

break ;

case value 2:

statements ;

break ;

default :

statements ;

}

C Program example of Switch case Enter month number and print month in character

// Program name : test060.c

// example of Switch case Enter month number and print month in character

#include <stdio.h>

#include <conio.h>

void main()

{

int mno;

clrscr();

printf( "Enter month number from 1 to 12 : ");

scanf("%d",&mno);

switch(mno)

{default:

printf("Month number not within 1 to 12 \n"); break;

case 1:

printf("January\n"); break;

case 2:

printf( "February\n"); break;

case 3:

printf("March\n"); break;

case 4:

printf("April\n"); break;

case 5:

printf("May\n"); break;

case 6:

printf("June\n"); break;

case 7:

printf("July\n"); break;

case 8:

printf("August\n"); break;

case 9:

printf("September\n"); break;

case 10:

printf("October\n"); break;

case 11:

printf("November\n"); break;

case 12:

printf("December\n");

}

getch();

}

Output

Enter month number from 1 to 12 : 8

August

Enter month number from 1 to 12 : 3

March

Enter month number from 1 to 12 : 15

Month number not within 1 to 12

C Program to Enter Month in number and Print no of days for that month

// Program name : test061.c

//WAP to Enter Month in number and Print no of days for that month

#include <stdio.h>

#include <conio.h>

void main()

{

short mno;

printf("Enter month number from 1 to 12: ");

scanf("%d",&mno);