computefactorial.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// ComputeFactorial.java: Compute factorial of an integer
public class ComputeFactorial
{
  public static void main(String[] args)
  {
    // Prompt the user to enter an integer
    System.out.println("Please enter a nonnegative integer");
    int n = MyInput.readInt();

    System.out.println("Factorial of " + n + " is " + factorial(n));
  }

  // Recursive method for computing factorial of n
  static long factorial(int n)
  {
    if (n == 0) // Stopping condition
      return 1;
    else
      return n*factorial(n-1); // Call factorial recursively
  }
}