Switch case Statement in C language

•Switch case statement:

This control statement , which allows us to make a decision from the number of choice, is called a switch. with the help of switch case statement we may choose any number of decisions, or more correctly a switch-case default, since the combination of these three key words go together to make up the control statement.

Syntax:

switch (expression)

{

     case 1:

     statement (Group 1)

     case 2:

     statement ( Group 2)

     case 3:

     statement ( Group 3)

     default

     statement ( Group 4)

}

The switch statement checks, whether an expression matches with number of integer or character constant.

Example-

For "if - else"

#include<stdio.h>

void main()

{

int age;

printf ("Enter your age");

scanf("%d",&age);

if (age>=18)

printf("you can vote ")

else 

printf ("You can't vote");

}

Example: For "Switch - case"

To calculate simple interest and compound interest.

#include<stdio.h>

#include<conio.h>

void main()

{

int ch;

float ,p,r,t,si,ci;

clrscr();

printf ("Enter principal");

scanf("%f,&p);

printf ("Enter rate\n");

scanf ("%f" ,& t);

printf("n1.Simple Interest");

printf("n2.Compound Interest");

printf ("\n Enter your choice \n");

scanf ("%d" , &ch);

switch (ch)

{

case 1:

si=(p*r*t*)/100;

printf ("%f\n" ,si);

break;

case 2:

ci= p((1+r/100)^t-p);

printf ("%f\n",ci);

break;

default:

printf ("wrong choice");

}

getch();

}