Programming Fundamentals: Variables and Data Storage

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Questions and Answers

What is the purpose of any IT system?

  • To create spreadsheets
  • To process data (correct)
  • To design user interfaces
  • To play music

How are variables described in programming?

  • Containers for storing only text data
  • Cells that can store multiple items of data
  • Spaces allocated for storing images
  • Areas of memory that store one item of data (correct)

Why do programmers choose variable names?

  • To increase program complexity
  • To confuse other programmers
  • To make programming more challenging
  • To simplify programming tasks (correct)

In which languages are variables a fundamental feature?

<p>All languages, including Python (C)</p>
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What does declaring a variable accomplish?

<p>Creates the container for storing a value (A)</p>
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What is the role of variables in programming languages?

<p>Variables allow manipulation of any kind of data (D)</p>
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What is a key difference between arrays and lists in Python?

<p>Arrays can contain elements of different types, while lists cannot. (D)</p>
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In Python, what are associative arrays called?

<p>Dictionaries (A)</p>
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What allows you to apply a function to any object in an array?

<p>Loops (B)</p>
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Which programming languages use vectors instead of arrays?

<p>C++ (B)</p>
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What is the purpose of data abstraction in programming?

<p>To centralize data-storage functions and reduce code repetition (D)</p>
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Which data structure uses integers to separately store minutes and hours?

<p>Time type (D)</p>
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In Python, what allows you to add a new element to a list?

<p>.append() method (B)</p>
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What is the purpose of associative arrays?

<p>To allow string or type indexes instead of numbers (C)</p>
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What differentiates arrays from lists in Python regarding elements' types?

<p>Arrays allow multiple types of elements in a single array, but lists need all elements to be the same type. (D)</p>
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What is the key difference between associative arrays and normal arrays?

<p>Associative arrays allow for key-value pairs, while normal arrays don't have key-value associations. (A)</p>
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What feature in Python distinguishes it from most procedural programming languages?

<p>Automatic type selection based on stored values (B)</p>
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Which programming language mentioned does not require explicit typing of variables?

<p>Python (B)</p>
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What is the purpose of declaring a variable as 'static' in a function?

<p>To retain the variable's value across function calls (D)</p>
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In which type of scope can a local variable be used?

<p>Within the function where it was declared (D)</p>
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What character is commonly used as a suffix in BASIC to declare a string type?

<p>$ (D)</p>
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Which language uses different terms for data types, such as 'short' instead of 'integer'?

<p>C (C)</p>
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What is the primary purpose of using arrays in programming?

<p>To represent collections of similar items efficiently (B)</p>
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What does the scope of a global variable encompass?

<p>The entire application (A)</p>
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What is the difference between declaring a local variable and a static variable in a function?

<p>Local variables get re-declared and reset each time the function runs, while static variables retain their values. (C)</p>
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What is the main purpose of using constants in programming?

<p>To refer to mathematical values by name instead of remembering them (B)</p>
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In Visual BASIC, which of the following is an example of a predefined constant?

<p>vbYesNo (B)</p>
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How does Python handle constants?

<p>Python uses variables for the same purpose as constants, with the convention of using uppercase names (B)</p>
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What is the advantage of using constants in compiled languages?

<p>Constants are replaced with their actual values during compilation, reducing memory requirements and improving efficiency (A)</p>
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In the context of programming, what does the term 'constant' refer to?

<p>A named value that cannot be changed at run-time (C)</p>
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What is the process of replacing constant names with their actual values called in compiled languages?

<p>Find and Replace (A)</p>
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