##### Question

In: Computer Science

# Write down the C++ Program To Find Factorial.

Write a function, which accepts an integer value as an argument, finds the factorial of that integer value, and then returns the factorial value to the main program. Write a main program that will call the function by passing an integer value and print the factorial value returned by the function.

## Solutions

##### Expert Solution

1. First we create a function called findFactorial .

 void findFactorial(int number) { }

2. Now we implement logic in out findFactorial function.

 void findFactorial(int number) { int factorial = 1; if (number == 0) { cout << "Please enter some number"; } else { for (int i = 1; i <= number; i++) { factorial = factorial * i; } } cout << "Factorial of " << number << " is: " << factorial; }  2.1: The main logic is to create a variable named factorial and give a value 1 .
2.2: Now using the if statement we check if the user input value is zero or not
2.3: After that, we show a simple message and use for loop for the main logic
2.4: in for loop we declare variable i and give it value 1 and we say that i is less than user given number and increment the i .
2.5: then we multiply this by factorial variable with i and store in factorial variable and return the variable factorial

3. Now we call in the main function.  int main() { int inputInteger; cout << "Enter an Integer: "; cin >> inputInteger; findFactorial(inputInteger); getch(); } 

And the whole program looks like this:

 #include #include using namespace std; void findFactorial(int); int main() { int inputInteger; cout << "Enter an Integer: "; cin >> inputInteger; findFactorial(inputInteger); getch(); } void findFactorial(int number) { int factorial = 1; if (number == 0) { cout << "Please enter some number"; } else { for (int i = 1; i <= number; i++) { factorial = factorial * i; } } cout << "Factorial of " << number << " is: " << factorial; } 

#include <iostream>

#include <conio.h>

using namespace std;

void findFactorial(int);

int main()

{

    int inputInteger;

    cout << "Enter an Integer: ";

    cin >> inputInteger;

    findFactorial(inputInteger);

    getch();

}

void findFactorial(int number)

{

    int factorial = 1;

    if (number == 0)

    {

        cout << "Please enter some number";

    }

    else

    {

        for (int i = 1; i <= number; i++)

        {

            factorial = factorial * i;

        }

    }

    cout << "Factorial of " << number << " is: " << factorial;

}

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