Arithmetic calculator using C

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

int n;

float a,b,x;

clrscr();

printf("Calculator Menu\nSelect an option:\n1. Addition\n2. Subtraction\n3. Multiplication\n");

scanf("%d",&n);

switch(n)

{

case 1: printf("Enter 2 numbers:\n");

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

x=a+b;

printf("%f+%f=%f",a,b,x);

break;

case 2: printf("Enter 2 numbers:\n");

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

x=a-b;

printf("%f-%f=%f",a,b,x);

break;

case 3: printf("Enter 2 numbers:\n");

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

x=a*b;

printf("%f x %f=%f",a,b,x);

break;

default: printf("Invalid choice");

}

getch();

}