C program to demonstring switch statement using break statement

SOURCE CODE:
#include<stdio.h>
#include<conio.h>
void main()
{
 int a,b;
 char choice;
 float c;
 clrscr();
 printf("enter first number :");
 scanf("%d",&a);

 printf("enter second number :");
 scanf("%d",&b);
 printf("\nPRESS + for addition\n- for subtraction\n* for multiplication\n/ for division.");
 printf("\n\nenter your choice :");
 choice=getche();
 switch(choice)
 {
  case '+':c=a+b;
     printf("\nans is %f",c);
     break;
  case '-':c=a-b;
     printf("\nans is %f",c);
     break;
  case '*':c=a*b;
     printf("\nans is %f",c);
     break;
  case '/':c=(float)a/b;
     printf("\nans is %f",c);
     break;
 default : printf("\ninvalid input");
 }
getch();