What will be the output of the program?

Question image

Understand the Problem

The question is asking for the output of a Java program that includes a for loop and an if statement. We need to analyze the code to determine the values of variables 'x' and 'y' after execution and then print their values.

Answer

The output is `6 3`.
Answer for screen readers

The output of the program will be 6 3.

Steps to Solve

  1. Initialize Variables

The program starts with two variables:

  • $x = 0$
  • $y = 0$
  1. Understanding the Loop

There's a for loop that will run with a variable $z$ from $0$ to $4$ (5 iterations).

for (int z = 0; z < 5; z++)
  1. Analyze the If Condition

Within the loop, there is an if condition:

if ((++x > 2) && (++y > 2))
  • The first part of the condition, $++x > 2$, increments $x$ before checking if it's greater than $2$.
  • If the condition is false, the second condition ($++y > 2$) is not evaluated due to short-circuiting.
  1. Evaluate Each Iteration

Iteration 1: ($z = 0$)

  • $x$ becomes $1$ (from $0$).
  • Condition: $1 > 2$ is false. $y$ remains $0$.

Iteration 2: ($z = 1$)

  • $x$ becomes $2$.
  • Condition: $2 > 2$ is false. $y$ remains $0$.

Iteration 3: ($z = 2$)

  • $x$ becomes $3$.
  • Condition: $3 > 2$ is true. Now it evaluates $++y$, which makes $y = 1$, and $1 > 2$ is false.

Iteration 4: ($z = 3$)

  • $x$ becomes $4$.
  • Condition: $4 > 2$ is true. Now, $++y$ makes $y = 2$, and $2 > 2$ is false.

Iteration 5: ($z = 4$)

  • $x$ becomes $5$.
  • Condition: $5 > 2$ is true. Now $++y$ increments $y$ to $3$, and $3 > 2$ is true. So $x$ is incremented to $6$.

After five iterations, the final values are:

  • $x = 6$
  • $y = 3$
  1. Print the Result

The result printed is:

System.out.println(x + " " + y);

This will output 6 3.

The output of the program will be 6 3.

More Information

This Java program uses a for loop along with pre-increment operators and short-circuit evaluation. The variable checks demonstrate how conditions are processed in a loop, with updates happening based on previous iterations.

Tips

  • Failing to account for the short-circuit behavior of &&, which may lead to unexpected results if evaluating both sides of the condition.
  • Misunderstanding the pre-increment operation can lead to incorrect counts.

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