Which declaration initializes a boolean to true?

Which declaration initializes a boolean to true?

• A. boolean isVisible = true;
• B. boolean isVisible = false;
• C. boolean isVisible = "true";
• D. boolean isVisible = 1;

Answer: (A)

Booleans hold either true or false, so to initialize a boolean to true you must use the boolean literal true (without quotes). The declaration that uses true directly sets the value to the actual boolean true, which is the correct way to initialize a boolean variable to that state. Using false would set it to false, not true. Putting "true" in quotes makes it a string, not a boolean value, so that isn’t valid for a boolean assignment. Writing 1 uses a numeric value, and booleans expect a true or false literal rather than a number. So the only correct way to initialize to true is the declaration that uses the true literal.

Booleans hold either true or false, so to initialize a boolean to true you must use the boolean literal true (without quotes). The declaration that uses true directly sets the value to the actual boolean true, which is the correct way to initialize a boolean variable to that state. Using false would set it to false, not true. Putting "true" in quotes makes it a string, not a boolean value, so that isn’t valid for a boolean assignment. Writing 1 uses a numeric value, and booleans expect a true or false literal rather than a number. So the only correct way to initialize to true is the declaration that uses the true literal.