#include <stdio.h>

int main()
{

//Variables for numbers entered

int number1 = 0;
int number2 = 0;

//Variables for answers

double answerAdd = 0;
double answerSubtract = 0;
double answerMultiply = 0;
double answerDivide = 0;

//Variables for validation

int ch = 0;
int valid1 = 0;
int valid2 = 0;

//Prompting user for the numbers (not accepting 0 because you can't divide by zero)

        while (valid1 == 0)
    {

        puts("Please enter your first number.");
        scanf("%d", &number1);
        while ( ( ch = getchar() ) != '\n' && ch != EOF );

        printf("You entered %d\n", number1);
        if (number1 != 0) {
        valid1 = 1;
        }
    }

        while (valid2 == 0)
    {

        puts("Please enter your second number.");
        scanf("%d", &number2);
        while ( ( ch = getchar() ) != '\n' && ch != EOF );

        printf("You entered %d\n", number2);
        if (number1 != 0) {
        valid2 = 1;
        }
    }

    //Calculating answers

    answerAdd = addThem(number1, number2);
    answerSubtract = subtractThem(number1, number2);
    answerMultiply = multiplyThem(number1, number2);
    answerDivide = divideThem(number1, number2);

    //Displaying the answers

printf("\nIf you add %d and %d you get %d",number1, number2, answerAdd);
printf("\nIf you subtract %d from %d you get %d",number2, number1, answerSubtract);
printf("\nIf you multiple %d by %d you get %d",number1, number2, answerMultiply);
printf("\nIf you divide %d by %d you get %d",number1, number2, answerDivide);


    return 0;
}

double addThem(double number1, double number2)
{
    double answerAdd = 0;

    answerAdd = number1 + number2;

    return answerAdd;
}

double subtractThem(double number1, double number2)
{
    double answerSubtract = 0;

    answerSubtract = number1 - number2;

    return answerSubtract;
}

double multiplyThem(double number1, double number2)
{
    double answerMultiply = 0;

    answerMultiply = number1 * number2;

    return answerMultiply;
}

double divideThem(double number1, double number2)
{
    double answerDivide = 0;

    answerDivide = number1 / number2;

    return answerDivide;
}