kill me

#include <stdio.h>

int input(int input_var)
{
	printf("Please enter a number! - ");
	scanf("%d", &input_var);

	return;
}

int calc(int input_var)
{
	int i, factorial;
	for (i = input_var; i >= 1; i--)
	{
		factorial = factorial * i;
	}

	input_var = factorial;

	return;
}

int output(int input_var)
{
	printf("The factorial of your chosen number is %d", input_var);

	return;
}


int main()
{
	int input_var;
	int factorial;

	input(input_var);
	calc(input_var);
	output(input_var);

	return 0;
}