Max of Four

Say that you need the maximum of four integers. Call them A, B, C, and D. One way to do this is to

Compute the max of A and B. Call it MaxAB.
Compute the max of C and D. Call it MaxCD.
Compute the max of MaxAB and MaxCD.

There is a static max()method of the Math class that computes the maximum of two integers. But let us ignore that.

Here is a program that implements this idea.

public class UnitTestMax
{
   
  public static int maxTwo( int X, int Y)
  {
    if ( X > Y )
      return X;
    else
      return Y;
  }

  public static int maxFour( int A, int B, int C, int D)
  {
    int maxAB = maxTwo( A, B );
    int maxCD = maxTwo( C, D );
    return maxTwo( maxAB, maxCD );
  }
  
  public static void main (String[] args ) 
  {
    int A= -8, B= 7, C= 21, D= 10;
    System.out.println("The max of " + A + ", " + B + ", " + C + ", " + D + " is: " + 
      maxFour( A, B, C, D ) );
  }
}

QUESTION 15:

Would the following work?

public static int maxFour( int A, int B, int C, int D)
  {
    return maxTwo( maxTwo( A, B ), maxTwo( C, D ) );
  }

Answer:

Max of Four

QUESTION 15: