Write a C++ program that calls a function factorial to calculate n! where n is a positive integer. Use a for loop in the main program to test more than one case. Include a while loop for the error check, n must be positive. Use a for loop within the function to calculate the factorial.

Guide:

// Purpose of Program

// Name:

// Filename: LASTNAMElab7b.cpp

#include using namespace std;

// Function Prototype

int factorial (int num);

int main()

{

DECLARATION OF VARIABLES

cout << "How many test cases: ";

INPUT cases

cout << endl;

FOR LOOP loop for each test case USE i AS THE LOOP COUNTER

{

cout << " Test Case #" << i << ": " << endl;

INPUT num WITH PROMPTING MESSAGE

// Error Check - while LOOP WHILE LOOP while num IS LESS THAN ZERO

{

cout << "Invalid Entry - n must be positive. ";

INPUT num WITH PROMPTING MESSAGE }

// Function Call result = factorial(num);

OUTPUT THE result

}

cout << endl; return 0;

}

// Function Definition

int factorial(int num)

{

DECLARATION OF LOCAL VARIABLES INITIALIZE fact TO ONE FOR LOOP loop num times USE count AS THE LOOP COUNTER MULTIPLY fact BY count STORING RESULT IN fact

RETURN STATEMENT

}