public class ExpressionExample {
  public static void main(String[] args) {
    double a = 5.0, b = 10.0, c = 20.0;
    System.out.println("a+b is " + (a + b));
    System.out.println("a+b/c is " + (a + b  / c));
    System.out.println("a*b+c is " + (a * b + c));
    System.out.println("b/a+c/a is " + (b / a + c / a));
  }
}