Array Declaration and Access

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Questions and Answers

What is the purpose of declaring an array before using it in a program?

  • To ensure the elements are of the same data type
  • To reserve memory locations for the array elements (correct)
  • To allocate memory locations for the array in a non-consecutive manner
  • To specify the range of the array elements

In C/C++ programming, what is the correct syntax for declaring an array with 'n' elements?

  • data_type n array_name[];
  • n array_type array_name[];
  • array_name[data_type n];
  • array_type array_name[n]; (correct)

What is the range of an array with 'n' elements?

  • 1 to n
  • 0 to n
  • 0 to (n-1) (correct)
  • 1 to (n-1)

How can array elements be initialized at compile time?

<p>Using type array_name[size]={ list of values}; (C)</p> Signup and view all the answers

What is required during declaration of an array?

<p>Specifying the size of the array (A)</p> Signup and view all the answers

'An array must be declared before it is used' - Why is this statement true?

<p>'To allocate and reserve memory locations' (B)</p> Signup and view all the answers

'Arrays can be initialized at the time of declaration when their initial values are known in advance' - What does this statement imply?

<p>'Array elements can be set with values during declaration' (A)</p> Signup and view all the answers

'0 to (n-1) is the range of array' - What does this range indicate?

<p>'The first and last indexes of the array' (C)</p> Signup and view all the answers

'Arrays are stored in consecutive memory locations in RAM' - Why is this arrangement beneficial?

<p>'To enable faster access and retrieval of elements' (B)</p> Signup and view all the answers

'Declaration of an array is similar to declaring ordinary variables' - Why is this comparison made?

<p>'To stress that declaring an array involves specifying its size' (D)</p> Signup and view all the answers

What happens when the number of values to be initialized in an array is greater than the size of the array in C?

<p>The compiler throws an error due to excess values. (A)</p> Signup and view all the answers

When initializing an array with fewer values than its size, what does the compiler do in C?

<p>It initializes the extra memory locations to zero. (C)</p> Signup and view all the answers

In C, what happens when an array is initialized with all zeros?

<p>The compiler initializes all memory locations of the array to zero. (D)</p> Signup and view all the answers

What is the result of initializing an array without specifying its size in C?

<p>The compiler sets the array size to the number of initial values specified. (D)</p> Signup and view all the answers

What is the significance of a null character when initializing an array with a string in C?

<p>It indicates the end of the array and allocates one additional byte. (A)</p> Signup and view all the answers

What happens when an attempt is made to initialize a char variable with a string directly in C?

<p>The initialization results in a syntax error due to incompatible types. (C)</p> Signup and view all the answers

How can large arrays be initialized at runtime in C?

<p><code>scanf</code> can be utilized to input values for each element at runtime. (D)</p> Signup and view all the answers

What happens when 'scanf' is used to initialize an array at runtime in C?

<p><code>scanf</code> reads user input and assigns it to specific elements of the array. (A)</p> Signup and view all the answers

In partial array initialization in C, what value are uninitialized memory locations set to?

<p>'0' (D)</p> Signup and view all the answers

How does C handle partial array initialization when the number of values is less than the array size?

<p>It discards any extra values beyond those provided for initialization. (D)</p> Signup and view all the answers

What is the outcome of attempting partial initialization of an array in C with excess values compared to its size?

<p>The partial initialization fails and results in unpredictable behavior. (A)</p> Signup and view all the answers

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