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Easyjavaoperators

~60s

Integer and floating-point division in Java

What does this Java program print?

public class Main {
    public static void main(String[] args) {
        System.out.println(5 / 2 + " " + 5 / 2.0 + " " + 5 % 2);
    }
}
Show the answer and the worked solution

Correct answer: A.

2 2.5 1

Worked solution

  1. 5 / 2 is int division and yields 2.
  2. 5 / 2.0 promotes the 5 to double, so it yields 2.5.
  3. 5 % 2 is the remainder 1, and the three values are joined into 2 2.5 1.

Answer: 2 2.5 1.

The idea

Division stays in the integers only while both operands are integers; a single double operand promotes the whole expression. The arithmetic runs before any concatenation, because / and % outrank +.

Shortcut. Read each piece by its operand types: int ÷ int gives 2, int ÷ double gives 2.5, and 5 % 2 is 1, which matches one option only.

Common trap. "2.5 2.5 1" expects 5 / 2 to give 2.5, as in Python 3; with two int operands Java discards the fraction.

Programming Fundamentals

20 of 40

Level

Easy

Target time

~60s

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Integer and floating-point division in Java — Aptitude

Integer and floating-point division in Java: What does this Java program print? Answer and worked solution on CodeKairo.

Question

What does this Java program print?

public class Main {
    public static void main(String[] args) {
        System.out.println(5 / 2 + " " + 5 / 2.0 + " " + 5 % 2);
    }
}

Options

  1. 2 2.5 1
  2. 2 2.0 1
  3. 2 2.5 2
  4. 2.5 2.5 1
Show the answer and the worked solution

Correct answer: A. 2 2.5 1

Worked solution

  1. 5 / 2 is int division and yields 2.
  2. 5 / 2.0 promotes the 5 to double, so it yields 2.5.
  3. 5 % 2 is the remainder 1, and the three values are joined into 2 2.5 1.

Answer: 2 2.5 1.

The idea

Division stays in the integers only while both operands are integers; a single double operand promotes the whole expression. The arithmetic runs before any concatenation, because / and % outrank +.

Shortcut. Read each piece by its operand types: int ÷ int gives 2, int ÷ double gives 2.5, and 5 % 2 is 1, which matches one option only.

Common trap. "2.5 2.5 1" expects 5 / 2 to give 2.5, as in Python 3; with two int operands Java discards the fraction.

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