// ITI 1120 Winter 2012, Lab 4, Exercise 4-a
// Name: Gilbert Arbez, Student# 123456

/**
 * Requests from the user an integer value.
 * Calls tha problem solving method to compute N! and
 * displays the results of the calculation.
 */

class Lab4Ex4aSol
{
  public static void main (String args[ ])
  {
    // DECLARE VARIABLES/DATA DICTIONARY
    int n;  // number to calulate the factorial
    int nFact; // n!
    // PRINT OUT IDENTIFICATION INFORMATION
    System.out.println("ITI 1120 Winter 2012, Lab 4, Exercise 4-a");
    System.out.println("Name: Grace Hoper, Student# 12345678");
    System.out.println();   
    // READ IN GIVENS use our ITI1120 special class for keyboard input    
    System.out.print("Please enter a positive integer to calculate N!: ");
    n = ITI1120.readInt();
    // BODY OF ALGORITHM - Call to the method to solve problem
    nFact = calculateFact(n);
    // PRINT OUT RESULTS AND MODIFIEDS
    System.out.println("The factoriel is "+nFact);
  }
  
  // Problem Solving Method
  // Description: Calculate n!
  // Parameters (GIVENS): n - number to calculate factorial.
  public static int calculateFact(int n)
  {  
    // DECLARE VARIABLES/DATA DICTIONARY
    // INTERMEDIATES
    int count;  // count from 1 to N
    // RESULT
    int fact;  // The factoriel of n    
    // BODY OF ALGORITHM
    fact = 1;
    count = 1;
    while(count <= n) // si n est zéro, fact = 1
    {
      fact = fact * count;
      count = count+1;
    }    
    // RETURN RESULT
    return(fact);
  }  
} // Don't remove this brace bracket!