Array Basics and Structure

Questions and Answers

What is the correct syntax for declaring an array in C?

array_name[data_type] = n;

data_type array_name[size]; (correct)

array[data_type] array_name[n];

array_type array_name[n];

What happens to uninitialized elements of an array if less values than its declared size are provided?

They cause a compile-time error.

They are automatically set to zero. (correct)

They are initialized to random values.

They remain undefined.

Which of the following is a valid array initialization example?

int a = {1, 2, 3, 4};

int a[5] = {1, 2, 3}; (correct)

int a[3] = {1, 2, 3, 4};

float x[3] = {1.0, 2.0, 3.0, 4.0};

Which statement about array memory allocation is incorrect?

The size is specified at runtime. Signup and view all the answers

What is the consequence of declaring an array with fewer initial values than its size?

Remaining elements are set to zero. Signup and view all the answers

What happens during compile-time initialization?

Elements are initialized when array is declared. Signup and view all the answers

Which of the following correctly demonstrates initialization without specifying the size?

int a[] = {1, 2, 3}; Signup and view all the answers

What is the range of indices accessible in an array declared as 'data_type array_name[5];'?

0 to 4 Signup and view all the answers

Which of the following arrays will result in a compile-time error?

int c[4] = {1, 2, 3, 4, 5}; Signup and view all the answers

What type of data must all elements of an array be?

Same data type Signup and view all the answers

What is the automatic size set for the array declaration `char b[]={'C','O','M','P','U','T','E','R'};`?

8 Signup and view all the answers

What is the correct declaration for initializing an array with a string that includes a null terminator?

char b[]="COMPUTER"; Signup and view all the answers

What happens to the array size when explicitly initializing an array at runtime using a method like scanf?

Array size remains constant regardless of input Signup and view all the answers

Which of the following declarations is incorrect?

char b[]="HELLO"; char b[6]="WORLD"; Signup and view all the answers

If we have an array initialized as `int ch[]={1,0,3,5};`, what is the size of this array?

4 Signup and view all the answers

What would be the size of the array declared as `char b[]={'A','B','C','D','E','F'};`?

6 Signup and view all the answers

When using scanf to initialize an array, what type of data should the array be able to store?

Any type of integers Signup and view all the answers

What does a string array initialized with `char b[]="COMPUTER";` contain?

9 characters including a null terminator Signup and view all the answers

In the expression `scanf("%d %d %d", &x, &x, &x);`, how many variables does this initialization actually populate?

1 Signup and view all the answers

Why is the declaration `char b="COMPUTER";` incorrect?

It initializes a character instead of a character array Signup and view all the answers

What defines an array?

An ordered set of similar data items Signup and view all the answers

What happens during partial array initialization?

Compiler automatically assigns 0 to uninitialized elements. Signup and view all the answers

How is an array declared in C?

data_type array_name[n]; Signup and view all the answers

Which scenario would result in a compile-time error?

Declaring an array with size 3 but initializing it with 5 values. Signup and view all the answers

What defines the range of elements in an array declared as int myArray[10];?

0 to 9 Signup and view all the answers

When an array is initialized with all zeros, what is the correct syntax?

int a[]={0}; Signup and view all the answers

What type of data must all elements of an array be?

Uniform data type Signup and view all the answers

Which statement about initialization without size is true?

The compiler determines the size based on initial values. Signup and view all the answers

What error occurs when initializing an array with mismatched sizes?

Compiler error Signup and view all the answers

Which of the following is a valid scenario for initializing arrays at compile time?

Directly specifying values in braces Signup and view all the answers

What is the size of the array initialized with `char b[]={'C','O','M','P','U','T','E','R'};`?

8 Signup and view all the answers

What is the total size of the array initialized with the declaration `char b[]={'C','O','M','P','U','T','E','R'};`?

8 bytes Signup and view all the answers

What is the correct size of the array initialized as `char b[]='COMPUTER';`?

9 bytes Signup and view all the answers

How is an array initialized with a string represented in C?

Ends with a null character Signup and view all the answers

When declaring an array with `int ch[]={1,0,3,5};`, what is the method used to determine its size?

Automatically set by the number of values provided Signup and view all the answers

Which statement accurately describes the initialization of an array during runtime?

Can use functions to assign values dynamically Signup and view all the answers

What happens when an incorrect syntax is used for string declaration like `char b='COMPUTER';`?

It will cause a compile-time error Signup and view all the answers

Which of the following best describes how `scanf` initializes an array?

Can initialize multiple elements in a single call Signup and view all the answers

For the declaration `char b[]={'C','O','M','P','U','T','E','R'};`, which character is implicitly included in the array?

The null character Signup and view all the answers

In the statement `scanf("%d %d %d", &x, &x, &x);`, how many unique variables does this properly populate?

One unique variable Signup and view all the answers

What is the effect of initializing an array with fewer values than its size?

Remaining elements are set to zero Signup and view all the answers

What is the total number of bytes allocated for the array initialized as `char b[]="COMPUTER";`?

9 bytes Signup and view all the answers

What would be the size of the array declared with the statement `int ch[]={1,0,3,5};`?

4 elements Signup and view all the answers

If an array is initialized at run time using `scanf`, what is a critical consideration regarding its size?

The size should match the maximum number of inputs expected. Signup and view all the answers

What denotes the end of a string when an array is initialized as `char b[]="COMPUTER";`?

Null character Signup and view all the answers

In the context of array initialization without explicit size, what happens when fewer elements are initialized than the defined size?

The remaining elements are uninitialized. Signup and view all the answers

What is a valid array declaration that uses initialization without size?

int arr[]={2,4,6,8}; Signup and view all the answers

What is the length of the string 'COMPUTER' as initialized in the declaration `char b[]="COMPUTER";`?

9 Signup and view all the answers

What is the implication of the declaration `char b="COMPUTER";`?

It is incorrect and will cause a compilation error. Signup and view all the answers

When initializing an array explicitly at runtime, which method can be used in C?

scanf Signup and view all the answers

What happens to elements of an array during partial array initialization if more memory locations than initial values are specified?

They are initialized to a default value. Signup and view all the answers

Which of the following correctly demonstrates compile-time initialization of an array?

int a[] = {1, 2, 3, 4}; Signup and view all the answers

What is the maximum size index that can be accessed in an array declared with `float array_name[10];`?

9 Signup and view all the answers

In an array that is initialized with zeros at declaration, which of the following statements is false?

Values must be explicitly stated for each element. Signup and view all the answers

What will happen if an array is initialized with more values than its declared size?

A compile-time error will occur. Signup and view all the answers

Which statement accurately describes the conditions for compile-time initialization of an array?

It requires the compiler to know all initial values in advance. Signup and view all the answers

What is the correct outcome when an array is initialized as `int a[5] = {10};`?

The first element is set to 10, the rest are initialized to 0. Signup and view all the answers

When declaring an array with the expression `char b[] = {'A', 'B', 'C'};`, what implicit value is included?

A null terminator. Signup and view all the answers

Which of the following techniques is not valid for initializing an array without specifying its size?

char str[] = 'HELLO'; Signup and view all the answers

What is the purpose of specifying the size of an array during its declaration?

To reserve space in memory for the array elements. Signup and view all the answers

Study Notes

Definition of Array

An array is an ordered set of similar data items.
All elements reside in consecutive memory locations in RAM.
Elements must be of the same data type and are accessed using the same name.

Declaration of Arrays

Arrays must be declared before use, specifying the size during declaration.
Syntax for declaration: data_type array_name[n];
- n indicates the number of elements (indices range from 0 to n-1).

Initialization of Arrays

Compile Time Initialization

Elements can be initialized at the time of declaration if initial values are known.
General initialization syntax: type array-name[size] = {list of values};
All Specified Memory Locations
- Example: int a = {10, 15, 1, 3, 20}; initializes 5 elements.
- Error occurs if the number of initial values exceeds the declared size: int a = {9, 2, 4, 5, 6}; (too many values).
Partial Array Initialization
- Fewer values than declared size automatically initializes remaining elements to zero.
- Example: int a = {10, 15}; results in first two values initialized and remaining set to zero.
Initialization with All Zeros
- Example: int a = {0}; initializes all declared elements to zero.
Initialization without Size
- Size is determined by the number of initial values.
- Example: char b[] = {'C', 'O', 'M', 'P', 'U', 'T', 'E', 'R'}; creates an array of size 8.
String Initialization
- When initializing with a string, an additional null character is included.
- Example: char b[] = "COMPUTER"; results in size 9, as it includes the null terminator.

Run Time Initialization

Arrays can be initialized at runtime, often for large arrays.
Example: Using scanf to input values from the keyboard: int x; scanf("%d %d %d", &x, &x, &x);.

Key Points

Memory allocation for arrays is contiguous.
Automatic zero-initialization occurs for uninitialized elements in partial initializations.
The overall structure ensures the array maintains order and accessibility of elements.

Definition of Array

An array is an ordered set of similar data items.
All elements reside in consecutive memory locations in RAM.
Elements must be of the same data type and are accessed using the same name.

Declaration of Arrays

Arrays must be declared before use, specifying the size during declaration.
Syntax for declaration: data_type array_name[n];
- n indicates the number of elements (indices range from 0 to n-1).

Initialization of Arrays

Compile Time Initialization

Elements can be initialized at the time of declaration if initial values are known.
General initialization syntax: type array-name[size] = {list of values};
All Specified Memory Locations
- Example: int a = {10, 15, 1, 3, 20}; initializes 5 elements.
- Error occurs if the number of initial values exceeds the declared size: int a = {9, 2, 4, 5, 6}; (too many values).
Partial Array Initialization
- Fewer values than declared size automatically initializes remaining elements to zero.
- Example: int a = {10, 15}; results in first two values initialized and remaining set to zero.
Initialization with All Zeros
- Example: int a = {0}; initializes all declared elements to zero.
Initialization without Size
- Size is determined by the number of initial values.
- Example: char b[] = {'C', 'O', 'M', 'P', 'U', 'T', 'E', 'R'}; creates an array of size 8.
String Initialization
- When initializing with a string, an additional null character is included.
- Example: char b[] = "COMPUTER"; results in size 9, as it includes the null terminator.

Run Time Initialization

Arrays can be initialized at runtime, often for large arrays.
Example: Using scanf to input values from the keyboard: int x; scanf("%d %d %d", &x, &x, &x);.

Key Points

Memory allocation for arrays is contiguous.
Automatic zero-initialization occurs for uninitialized elements in partial initializations.
The overall structure ensures the array maintains order and accessibility of elements.

Definition of Array

An array is an ordered set of similar data items.
All elements reside in consecutive memory locations in RAM.
Elements must be of the same data type and are accessed using the same name.

Declaration of Arrays

Arrays must be declared before use, specifying the size during declaration.
Syntax for declaration: data_type array_name[n];
- n indicates the number of elements (indices range from 0 to n-1).

Initialization of Arrays

Compile Time Initialization

Elements can be initialized at the time of declaration if initial values are known.
General initialization syntax: type array-name[size] = {list of values};
All Specified Memory Locations
- Example: int a = {10, 15, 1, 3, 20}; initializes 5 elements.
- Error occurs if the number of initial values exceeds the declared size: int a = {9, 2, 4, 5, 6}; (too many values).
Partial Array Initialization
- Fewer values than declared size automatically initializes remaining elements to zero.
- Example: int a = {10, 15}; results in first two values initialized and remaining set to zero.
Initialization with All Zeros
- Example: int a = {0}; initializes all declared elements to zero.
Initialization without Size
- Size is determined by the number of initial values.
- Example: char b[] = {'C', 'O', 'M', 'P', 'U', 'T', 'E', 'R'}; creates an array of size 8.
String Initialization
- When initializing with a string, an additional null character is included.
- Example: char b[] = "COMPUTER"; results in size 9, as it includes the null terminator.

Run Time Initialization

Arrays can be initialized at runtime, often for large arrays.
Example: Using scanf to input values from the keyboard: int x; scanf("%d %d %d", &x, &x, &x);.

Key Points

Memory allocation for arrays is contiguous.
Automatic zero-initialization occurs for uninitialized elements in partial initializations.
The overall structure ensures the array maintains order and accessibility of elements.

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Description

This quiz explores the fundamentals of arrays, including their definition, declaration, and initialization. You'll learn the importance of arrays in programming and how to access their elements. Examples are provided to aid understanding.

Array Basics and Structure

Questions and Answers

What is the correct syntax for declaring an array in C?

What happens to uninitialized elements of an array if less values than its declared size are provided?

Which of the following is a valid array initialization example?

Which statement about array memory allocation is incorrect?

What is the consequence of declaring an array with fewer initial values than its size?

What happens during compile-time initialization?

Which of the following correctly demonstrates initialization without specifying the size?

What is the range of indices accessible in an array declared as 'data_type array_name[5];'?

Which of the following arrays will result in a compile-time error?

What type of data must all elements of an array be?

What is the automatic size set for the array declaration char b[]={'C','O','M','P','U','T','E','R'};?

What is the correct declaration for initializing an array with a string that includes a null terminator?

What happens to the array size when explicitly initializing an array at runtime using a method like scanf?

Which of the following declarations is incorrect?

If we have an array initialized as int ch[]={1,0,3,5};, what is the size of this array?

What would be the size of the array declared as char b[]={'A','B','C','D','E','F'};?

When using scanf to initialize an array, what type of data should the array be able to store?

What does a string array initialized with char b[]="COMPUTER"; contain?

In the expression scanf("%d %d %d", &x, &x, &x);, how many variables does this initialization actually populate?

Why is the declaration char b="COMPUTER"; incorrect?

What defines an array?

What happens during partial array initialization?

How is an array declared in C?

Which scenario would result in a compile-time error?

What defines the range of elements in an array declared as int myArray[10];?

When an array is initialized with all zeros, what is the correct syntax?

What type of data must all elements of an array be?

Which statement about initialization without size is true?

What error occurs when initializing an array with mismatched sizes?

Which of the following is a valid scenario for initializing arrays at compile time?

What is the size of the array initialized with char b[]={'C','O','M','P','U','T','E','R'};?

What is the total size of the array initialized with the declaration char b[]={'C','O','M','P','U','T','E','R'};?

What is the correct size of the array initialized as char b[]='COMPUTER';?

How is an array initialized with a string represented in C?

When declaring an array with int ch[]={1,0,3,5};, what is the method used to determine its size?

Which statement accurately describes the initialization of an array during runtime?

What happens when an incorrect syntax is used for string declaration like char b='COMPUTER';?

Which of the following best describes how scanf initializes an array?

For the declaration char b[]={'C','O','M','P','U','T','E','R'};, which character is implicitly included in the array?

In the statement scanf("%d %d %d", &x, &x, &x);, how many unique variables does this properly populate?

What is the effect of initializing an array with fewer values than its size?

What is the total number of bytes allocated for the array initialized as char b[]="COMPUTER";?

What would be the size of the array declared with the statement int ch[]={1,0,3,5};?

If an array is initialized at run time using scanf, what is a critical consideration regarding its size?

What denotes the end of a string when an array is initialized as char b[]="COMPUTER";?

In the context of array initialization without explicit size, what happens when fewer elements are initialized than the defined size?

What is a valid array declaration that uses initialization without size?

What is the length of the string 'COMPUTER' as initialized in the declaration char b[]="COMPUTER";?

What is the implication of the declaration char b="COMPUTER";?

When initializing an array explicitly at runtime, which method can be used in C?

What happens to elements of an array during partial array initialization if more memory locations than initial values are specified?

Which of the following correctly demonstrates compile-time initialization of an array?

What is the maximum size index that can be accessed in an array declared with float array_name[10];?

In an array that is initialized with zeros at declaration, which of the following statements is false?

What will happen if an array is initialized with more values than its declared size?

Which statement accurately describes the conditions for compile-time initialization of an array?

What is the correct outcome when an array is initialized as int a[5] = {10};?

When declaring an array with the expression char b[] = {'A', 'B', 'C'};, what implicit value is included?

Which of the following techniques is not valid for initializing an array without specifying its size?

What is the purpose of specifying the size of an array during its declaration?

Study Notes

Definition of Array

Declaration of Arrays

Initialization of Arrays

Compile Time Initialization

Run Time Initialization

Key Points

Definition of Array

Declaration of Arrays

Initialization of Arrays

Compile Time Initialization

Run Time Initialization

Key Points

Definition of Array

Declaration of Arrays

Initialization of Arrays

Compile Time Initialization

Run Time Initialization

What is the automatic size set for the array declaration `char b[]={'C','O','M','P','U','T','E','R'};`?

If we have an array initialized as `int ch[]={1,0,3,5};`, what is the size of this array?

What would be the size of the array declared as `char b[]={'A','B','C','D','E','F'};`?

What does a string array initialized with `char b[]="COMPUTER";` contain?

In the expression `scanf("%d %d %d", &x, &x, &x);`, how many variables does this initialization actually populate?

Why is the declaration `char b="COMPUTER";` incorrect?

What is the size of the array initialized with `char b[]={'C','O','M','P','U','T','E','R'};`?

What is the total size of the array initialized with the declaration `char b[]={'C','O','M','P','U','T','E','R'};`?

What is the correct size of the array initialized as `char b[]='COMPUTER';`?

When declaring an array with `int ch[]={1,0,3,5};`, what is the method used to determine its size?

What happens when an incorrect syntax is used for string declaration like `char b='COMPUTER';`?

Which of the following best describes how `scanf` initializes an array?

For the declaration `char b[]={'C','O','M','P','U','T','E','R'};`, which character is implicitly included in the array?

In the statement `scanf("%d %d %d", &x, &x, &x);`, how many unique variables does this properly populate?

What is the total number of bytes allocated for the array initialized as `char b[]="COMPUTER";`?

What would be the size of the array declared with the statement `int ch[]={1,0,3,5};`?

If an array is initialized at run time using `scanf`, what is a critical consideration regarding its size?

What denotes the end of a string when an array is initialized as `char b[]="COMPUTER";`?

What is the length of the string 'COMPUTER' as initialized in the declaration `char b[]="COMPUTER";`?

What is the implication of the declaration `char b="COMPUTER";`?

What is the maximum size index that can be accessed in an array declared with `float array_name[10];`?

What is the correct outcome when an array is initialized as `int a[5] = {10};`?

When declaring an array with the expression `char b[] = {'A', 'B', 'C'};`, what implicit value is included?