math2.java

来自「java2 primer plus一书源程序」· Java 代码 · 共 43 行

public class Math2 {
  public static int square( int n ) {
    return n*n;
  }

  public static int cube( int n ) {
    return n*n*n;
  }

  public static int toThePower( int n, int power ) {
    int result=n;
    for( int i=0; i<power; i++ ) {
       result *= n;
    }
    return result;
  }

  public static int factorial( int n ) {
    int result = n;
    for( int i=n-1; i>0; i-- ) {
       result *= i;
    }
    return result;
  }

  public static boolean isPrime( int n ) {
    // Your turn..
    return false;
  }

  public static void showNumber( String operation, int n ) {
    System.out.println( "The result of the " + operation + " is " + n );
  }

  public static void main( String[] args ) {
    int a = 5;
    showNumber( "Square", square( a ) );
    showNumber( "Cube", cube( a ) );
    showNumber( "To The Power", toThePower( a, 4 ) );
    showNumber( "Factorial", factorial( a ) );
    
  }
}