C program for basic calculator using switch.

#include<stdio.h>

#include<conio.h>

void main(){

float ans,a,b;

int choice;

while(1) {

Clrscr();

printf("Basic calculator\n 1.Addition\n 2.Subtraction\n 3.Multipication\n 4.Division\n 5.Exit\n Enter your choice\n");

scanf("%d",&choice);

printf("Enter two numbers\n");

scanf("%f%f",&a,&b);

switch (choice) {

case 1: ans=a+b; break;

case 2: ans=a-b; break;

case 3: ans=a*b; break;

case 4: if (b!=0) ans=a/b; 

else printf("Value of b is not '0'\n Try Again!!"); 

break;

case 5: exit(0);

default: printf("Wrong input\n");

}

printf("answer is =%f\n",ans);

getch();

}

}