Task 1: Working with while loops (20 pts) The factorial of n, denoted n!, is def

Question

Task 1: Working with while loops (20 pts)
The factorial of n, denoted n!, is defined as:

0! = 1
1! = 1
n! = 1*2*3*….*n    for n > 1

So 4! = 1*2*3*4 = 24 and 6! = 1*2*3*4*5*6 = 720

Write an algorithm (pseudocode) to do the following:
prompt user to input an integer number n ( >= 0)
calculate the factorial of the number entered
output the result to standard output device

Create a flowchart for your algorithm using Raptor and verify it for the example cases listed above.

Modify your flowchart of Exercise 2 to valid the input using a loop that repeatedly prompts the user to enter a valid input (i.e. a number greater or equal to 0).

Write a C++ program for the flowchart of Exercise 3.

Explanation / Answer

#include <iostream>
using namespace std;

int main() {
int i, n, factorial = 1;

cout<<"Enter a positive integer: ";
cin>>n;

for (i = 1; i <= n; ++i) {
factorial *= i; // factorial = factorial * i;
}

cout<< "Factorial of "<<n<<" = "<<factorial;
return 0;
}

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