class BasicMath{
  public static void main(String args[]) {
	//用整型變量實現各個基本算術運算符的功能。
    System.out.println("Integer Arithmetic");
    int ia = 1 + 2;
    int ib = ia * 4;
    int ic = ib /5;
    int id = ic - ia;
    int ie = -id;
    System.out.println("ia = " + ia);
    System.out.println("ib = " +ib);
    System.out.println("ic = " + ic);
    System.out.println("id = " + id);
    System.out.println("ie = " + ie);
    //用浮點型變量實現各個基本算術運算符的功能。
    System.out.println("\nFloating Point Arithmetic");
    double da = 1 + 2;
    double db = da * 4;
    double dc = db / 5;
    double dd = dc - da;
    double de = -dd;
    System.out.println("da = " + da);
    System.out.println("db = " + db);
    System.out.println("dc = " + dc);
    System.out.println("dd = " + dd);
    System.out.println("de = " + de);
  }
}