Java quiz 36: Conditional statement with boolean

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This is a simple conditional statement using a boolean variable.

Java quiz 36: Conditional statement with boolean

Level: Easy

What happens if the following code is compiled and run?

public class MyClass
{
  public static void main(String[] args)
  {
    boolean isGood = false;
    for(int i = 0; i < 3; i++)
    {
      if(isGood)
      {
        System.out.print("x");
        isGood = false;
      }
      else
      {
        System.out.print("y");
        isGood = true;
      }
    }
  }
}
Author: Sar Maroof

Select the correct answer.

a. This program writes “yyy” to the standard output.
b. This program writes “yxy” to the standard output.
c. This program writes “yyx” to the standard output.
d. This program writes “xyx” to the standard output.
e. This program writes “xyy” to the standard output.
f. Illegal at compile time.
g. Illegal at run time.

Answer explanation

  1. The first if statement if(isGood) returns false, because the initial value of the boolean variable isGood is false. The statement System.out.print(“y”); writes y to the standard output.
  2. The statement isGood = true; changes the value of the variable isGood to true. The next time the statement if(isGood) returns true and the statement System.out.print(“x”);
    writes x to the standard output. The statement isGood = false; assigns false to the variable isGood.
  3. The next time when the statement if(isGood) is executed, y is written to the standard output.

The correct answer is: b.

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