Java Programming - Java.lang Class
- Java.lang Class - General Questions
- Java.lang Class - Finding the output
- Java.lang Class - Pointing out the correct statements
What is the value of "d" after this line of code has been executed?
double d = Math.round ( 2.5 + Math.random() );
The Math.random() method returns a number greater than or equal to 0 and less than 1 . Since we can then be sure that the sum of that number and 2.5 will be greater than or equal to 2.5 and less than 3.5, we can be sure that Math.round() will round that number to 3. So Option B is the answer.
The return value of the Math.abs() method is always the same as the type of the parameter passed into that method.
In the case of A, an integer is passed in and so the result is also an integer which is fine for assignment to "int a".
The values used in B, C & D respectively are a double, a float and a long. The compiler will complain about a possible loss of precision if we try to assign the results to an "int".
- Math.max(1,4)
- Math.max(2.3, 5)
- Math.max(1, 3, 5, 7)
- Math.max(-1.5, -2.8f)
(1), (2), and (4) are correct. The max() method is overloaded to take two arguments of type int, long, float, or double.
(3) is incorrect because the max() method only takes two arguments.
public class Myfile
{
public static void main (String[] args)
{
String biz = args[1];
String baz = args[2];
String rip = args[3];
System.out.println("Arg is " + rip);
}
}
Arguments start at array element 0 so the fourth arguement must be 2 to produce the correct output.