Menu Driven Simple Calculator [ C Program Code]

We have created a basic menu driven calculator using the C programming language. This code seems lengthy, but it's easy to understand when looked upon. In this program, we have used a switch statement, goto statement & if else if loop to code it. The features of this program are :

• Alerts the user about Zero division
• Allows the user to run the program again and again without closing it.
• Alerts the user about an invalid selection of choice.

	#include<stdio.h>
	int main()
	{
	int n,a,b;
	start:
	printf("Enter the value of a: ");
	scanf("%d",&a);
	printf("Enter the value of b: ");
	scanf("%d",&b);
	printf("MENU\n1 - Addition\n2 - Subtraction\n3 - Multiplication\n4 - Division\n5 - Modulo division");
	printf("\nEnter your choice: ");
	scanf("%d",&n);
	switch(n)
	{
	case 1:
	printf("%d + %d = %d",a,b,a+b);
	break;
	case 2:
	printf("%d - %d = %d",a,b,a-b);
	break;
	case 3:
	printf("%d X %d = %d",a,b,a*b);
	break;
	case 4:
	if(b == 0)
	printf("Division is not possible!");
	else
	{
	printf("%d / %d = %f",a,b,(float)a/b);
	}
	break;
	case 5:
	printf("%d mod %d = %d",a,b,a%b);
	break;
	default:
	printf("Invalid Entry!! Check the menu for choice");
	break;
	}
	end:
	printf("\nTo terminate press 0 and to go back to the program press 1: ");
	scanf("%d",&n);
	if(n == 1)
	{
	goto start;
	}
	else if(n == 0)
	{
	goto terminate;
	}
	else
	{
	printf("\nInvalid entry");
	goto end;
	}
	terminate:
	return(0);
	}

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