/* These are includes */
#include <stdio.h>

/* This is the main function */
int main(void){
	/* You guessed it, more declarations */
	int choice=0;
	int in0=0;
	int in1=0;
	/* Clear the screen and show the options */
	system("CLS");
	printf("What do you want to do?");
	printf("\n1) Add\n2) Subtract\n");
	printf("3) Multiply\n4) Divide\n");
	printf("What is your choice? ");
	/* Prompts for input */
	scanf("%d", &choice);
	printf("\n\n");
	if(choice!=1 && choice!=2 && choice!=3 && choice!=4){
		/* If the choice is invalid, tell the user */
		printf("Not a valid choice!");
	}
	else{
		/* If the choice is valid, prompt for input and
		   perform the calculation                      */
		printf("What are the two numbers?\nFirst number? ");
		scanf("%d", &in0);
		printf("Second number? ");
		scanf("%d", &in1);
			if(choice==1){
			printf("\n\nThe answer is %d", in0+in1);
		}

		if(choice==2){
			printf("\n\nThe answer is %d", in0-in1);
		}

		if(choice==3){
			printf("\n\nThe answer is %d", in0*in1);
		}

		if(choice==4){
			printf("\n\nThe answer is %d", in0/in1);
		}
	}
}