// exj3.java  example declare variables, list, arrays

import java.io.*;  // needed for input and output

public class exj3  // class name same as file name
{
  // declarations for entire class may go here
    
  public exj3() // constructor same as class name
  {
    // declarations for this procedure go here
    // typically first, yet may be in code, just before use
    int i = 1;             // optional initialization 32 bit
    byte i8 = 1;           // 8 bit
    short i16 = 1;         // 16 bit
    long i64 = 0xabcdef01; // 64 bit initialized with hexadecimal
    float x = 39.27F;      // needs  F  else warning
    double y = 127.5E200;
    boolean me = true;     // could be  false
    String msg = "short";  // uppercase S for type String

    int vec[] = {1, 2, 4, 8};     // initialize an array, any type
    double av[] = {1.5, 2.2, 9.1};
    String as[] = {"abc", "xyz", "more"};
    int mat[][] = {{1,2,3},{2,3,4},{3,4,5},{4,5,6}}; // 4 by 3 matrix

    int big[] = new int[100];       // allocate space for 100 integers
    double small[] = new double[5]; // space for 5 doubles
    double matrix[][] = new double[4][3]; // matrix 4 rows of 3 doubles
    
    System.out.println("exj3.java running");
    System.out.println("i="+i);
    // System.out.println("mat="+mat); must print with loops
    
  } // end constructor exj3         optional comment

  public static void main (String[] args)
  {
    new exj3();
  }
} // end class exj3               optional comment