AP CSA Unit 1 Review

A Painter object called Pablito is facing North. Considering the following code, the effect of this code is that the Pablito object is now:

• facing north

• facing south

• facing east

• facing west

• in an infinite loop

Which of the following statements is true?

• Performing a task in a program requires a method

• A method contains the statements that actually performs its task

• The algorithm that the method represents can consist of a combination of sequencing, selection and iteration

• All of the above

Answer explanation

All statements are true: a method is essential for task execution, it contains the necessary statements, and its algorithm can involve sequencing, selection, and iteration. Therefore, the correct answer is 'All of the above'.

A Painter object called Mildred is initially facing south. Consider the following code segment. After the loop has terminated, which of the following must be true.

• The Mildred object is blocked from moving north

• The Mildred object is blocked from moving south

• The Mildred object is blocked from moving east

• The Mildred object is blocked from moving west

Answer explanation

Mildred starts facing south. If the loop involves moving south, she would be blocked from moving further south, confirming that she cannot move in that direction after the loop ends.

Which of the following statements is false

• An object's atributes are specified in a class

• A Chef object would likely have a menu attribute that represents the food they make

• Each Chef object knows its Menu but not the Menu of other Chef objects

• Attributes are specified by the class's methods

Answer explanation

The statement 'Attributes are specified by the class's methods' is false. Attributes are defined in the class itself, while methods define the behavior of the class. Attributes hold data, whereas methods operate on that data.

Consider the following Painter class

Given a Painter object called judy, which method call would cause a syntax error?

• judy.move( );

• judy.turnLeft( );

• judy.canMove( )

• judy.takePaint( );

Consider the following Painter class

Given a Painter object called judy, which method call would cause a syntax error?

• judy.move( );

• judy.turnLeft( );

• judy.paint( );

• judy.takePaint( );

Answer explanation

The method call judy.paint( ); causes a syntax error because it likely requires parameters or is not defined in the Painter class. The other methods judy.move( );, judy.turnLeft( );, and judy.takePaint( ); are valid.