Java OCA OCP Practice Question 2391

Question

Which of the following methods correctly accepts three integers as method arguments and returns their sum as a floating-point number? 

a  public void addNumbers (byte arg1, int arg2, int arg3) {  
       double sum = arg1 + arg2 + arg3; 
   } //from  w  w  w  . j  a v  a2  s  .  com

b  public double subtractNumbers (byte arg1, int arg2, int arg3) { 
       double sum = arg1 + arg2 + arg3; 
       return sum; 
   } 

c  public double numbers (long arg1, byte arg2, double arg3) { 
       return arg1 + arg2 + arg3; 
   } 

d  public float m(long a1, long a2, short a977) { 
       double sum = a1 + a2 + a977; 
       return (float)sum; 
   } 



b, d

Note

Option (a) is incorrect.

The question specifies the method should return a decimal number (type double or float), but this method doesn't return any value.

Option (b) is correct.

This method accepts three integer values that can be automatically converted to an integer: byte, int, and int.

It computes the sum of these integer values and returns it as a decimal number (data type double).

Note that the name of the method is subtractNumbers, which doesn't make it an invalid option.

Practically, you wouldn't name a method subtractNumbers if it's adding them.

But syntactically and technically, this option meets the question's requirements and is a correct option.

Option (c) is incorrect.

This method doesn't accept integers as the method arguments.

The type of the method argument arg3 is double, which isn't an integer.

Option (d) is correct.




PreviousNext

Related