#include <stdio.h>
#include <stdlib.h>

int main() {
	/* Display a message before the program initiates */
	printf("Preform an operation on two numbers.\n\n");

	float n1, n2, r; /* Number One, Number Two, and Result */
	char o; /* Operator */

	/* Prompt the user for the numbers */
	printf("Enter the first number: ");
	scanf("%f", &n1);

	printf("Enter the second number: ");
	scanf("%f", &n2);

	/* Prompt the user for the operator */
	printf("Enter the operator (+|-|*|/): ");
	scanf("\n%c", &o);


	/* Preform the operation */
	switch (o) {
		case '+':
			r = n1 + n2;

			break;
		case '-':
			r = n1 - n2;

			break;
		case '*':
			r = n1 * n2;

			break;
		case '/':
			/* Sanity Check
			 *
			 * If n2, the second number, equals 0,
			 * exit the program.
			 */
			if (n2 == 0) {
				printf("Error: Cannot devide by 0\n");
		
				exit(1);
			}


			r = n1 / n2;

			break;
		/* If the provided value of the operator
		 * is not (+|-|*|/), exit the program.
		 */
		default:
			printf("Error: Invalid argument\n");

			exit(1);
	}

	/* Print the result */
	printf("Result: %.2f", r);

			return 0;
}