Variables, Storage, and Commands in Programming

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Questions and Answers

Which type of command repeatedly executes a subcommand, known as the loop body?

  • Case-command
  • Conditional command
  • Sequential command
  • Iterative command (correct)

In Ada, the if-command can be extended to handle multiple conditions using which keyword?

  • otherwise
  • elsif (correct)
  • else-if
  • elif

What is the typical form of a sequential command?

  • C1; C2
  • C1/C2
  • C1, C2
  • C1 C2 (correct)

In C and Java, which keyword is used to specify a default action in a case-command?

<p>default (B)</p>
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What is the net effect of updating local variables in a procedure according to the text?

<p>No net effect (B)</p>
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What is the typical form of a skip command in Ada?

<p>&quot;null;&quot; (C)</p>
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In which type of programming languages are commands characteristic?

<p>Procedural (C)</p>
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What is the meaning of the multiple assignment expression "V1 =  = Vn = E;" in C and Java?

<p>The value of E is stored in each of V1, , Vn. (B)</p>
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Which PL construct is used to store a value in a variable?

<p>Assignment (C)</p>
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What does a procedure call achieve its effect by applying?

<p>Procedures (A)</p>
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What is the purpose of a constructor in a Java class?

<p>To create and initialize a new object of the class (D)</p>
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In Java, what does a method call with the form 'O.M(...)' do?

<p>Inspects and updates an existing object (D)</p>
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What does it mean if a class S is a subclass of class C?

<p>Objects of class S are richer than objects of class C (D)</p>
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What is the net effect of updating local variables in a procedure?

<p>The updated value is retained after the procedure ends (B)</p>
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What does it mean for a subclass to inherit its superclass's instance variables and methods?

<p>The subclass shares the same instance variables and methods as the superclass (A)</p>
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In the context of programming, what does encapsulation refer to?

<p>Making some components of a program unit private (C)</p>
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What does a package represent in programming?

<p>A named group of components declared for a common purpose (B)</p>
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What is the API of a program unit?

<p>The public bindings of the program unit (A)</p>
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What are the possible levels of privacy for components in a program unit?

<p>Private, protected, public (B)</p>
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What does a program unit's API consist of?

<p>Its public bindings only (D)</p>
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