Calculator with C Language

Here I am with one program today :). And here is the code how to make simple calculator. Actually I copied the code from here, and tried to understand it. So simple and make sense. 

	#include<stdio.h>
	int main()
	{
	/*This is a calculator programme. Calculator is able to perform the operation of two numbers*/
	int num;float a,b,c;
	printf("Hello World this is a calculator ");
	printf("\nchoose a number from the menu to operate the desired function");
	printf("\npress 1 for addition\npress 2 for subtraction\npress 3 for multiplication\npress 4 for division \n");
	scanf("%d",&num);
	/*The operation is performed using the switch case method*/
	switch(num)
	{
	case 1:
	printf("enter two numbers \n");
	scanf("%f%f",&a,&b);
	c= a+b;
	printf("the addition of two numbers is %f",c);
	break;
	case 2:
	printf("enter two numbers \n");
	scanf("%f%f",&a,&b);
	c=a-b;
	printf("the subtraction of two numbers is %f",c);
	break;
	case 3:
	printf("enter two numbers \n");
	scanf("%f%f",&a,&b);
	c=a*b;
	printf("the multiplication of two numbers is %f",c);
	break;
	case 4:
	printf("enter two numbers \n");
	scanf("%f%f",&a,&b);
	c=a/b;
	printf("the division of two numbers is %f ",c);
	}
	}

view raw calculator.c hosted with ❤ by GitHub