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Factorial.javaAPI DocExample1216Wed Apr 20 14:42:44 BST 2005None

Factorial

public class Factorial extends Object
This program computes the factorial of a number

Fields Summary
Constructors Summary
Methods Summary
public static doublefactorial(int x)

  // This method computes x!
    if (x < 0)                             // Check for bad input
      return 0.0;                          // If bad, return 0
    double fact = 1.0;                     // Begin with an initial value
    while(x > 1) {                         // Loop until x equals 1
      fact = fact * x;                     // Multiply by x each time
      x = x - 1;                           // And then decrement x
    }                                      // Jump back to start of loop
    return fact;                           // Return the result
public static voidmain(java.lang.String[] args)

 // The program starts here
    int input = Integer.parseInt(args[0]); // Get the user's input
    double result = factorial(input);      // Compute the factorial
    System.out.println(result);            // Print out the result