Calculator using 'c'

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#include<stdio.h>

#include<conio.h>

void main()

{

 float a,b,r;

 char op;

 clrscr();

 printf("Enter First Number:");

 scanf("%f",&a);

 printf("Enter the Operation:");

 scanf("%c",&op);

 printf("Enter Second Number:");

 scanf("%f",&b);

 switch(op)

 {

  case '+':

  r=a+b;

  printf("%f",r);

  break;

  case '-':

  r=a-b;

  printf("%f",r);

  break;

  case '*':

  r=a*b;

  printf("%f",r);

  break;

  case '/':

  r=a/b;

  printf("%f",r);

  break;

  default:

  printf("The Operation is not valid.");

  break;

 }

 getch();

}

OUTPUT:

Enter First Number:5

Enter the Operation:/

Enter Second Number:2

2.5