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

int main()
{
	printf("Please choose an option: \n 1. Add \n 2. Subtract \n 3. Multiply \n 4. Divide \n");
	printf("%s", "Option: ");

	int option;
	scanf("%i", &option);
	switch(option)
	{

		{
			int num1, num2, num3;

			printf("%s", "First number: ");
			scanf("%i", &num1);
			printf("%s", "Second number: ");
			scanf("%i", &num2);
			num3 = num1 + num2;

			printf("%d\n", &num3);
		}
	}
}

int add(int num1, int num2)
{
	return num1 + num2;
}

int subtr(int num1, int num2)
{
	return num1 - num2;
}

int mult(int num1, int num2)
{
	return num1 * num2;
}

int divide(int num1, int num2)
{
	return num1 / num2;
}