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Questions and Answers
What is the correct syntax for declaring an array in C?
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?
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?
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?
Which statement about array memory allocation is incorrect?
What is the consequence of declaring an array with fewer initial values than its size?
What is the consequence of declaring an array with fewer initial values than its size?
What happens during compile-time initialization?
What happens during compile-time initialization?
Which of the following correctly demonstrates initialization without specifying the size?
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];'?
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?
Which of the following arrays will result in a compile-time error?
What type of data must all elements of an array be?
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 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 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?
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?
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?
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 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?
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?
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?
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?
Why is the declaration char b="COMPUTER"; incorrect?
What defines an array?
What defines an array?
What happens during partial array initialization?
What happens during partial array initialization?
How is an array declared in C?
How is an array declared in C?
Which scenario would result in a compile-time error?
Which scenario would result in a compile-time error?
What defines the range of elements in an array declared as int myArray[10];?
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?
When an array is initialized with all zeros, what is the correct syntax?
What type of data must all elements of an array be?
What type of data must all elements of an array be?
Which statement about initialization without size is true?
Which statement about initialization without size is true?
What error occurs when initializing an array with mismatched sizes?
What error occurs when initializing an array with mismatched sizes?
Which of the following is a valid scenario for initializing arrays at compile time?
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 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 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';?
What is the correct size of the array initialized as char b[]='COMPUTER';?
How is an array initialized with a string represented in C?
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?
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?
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';?
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?
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?
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?
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 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 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};?
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?
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 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?
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 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 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 implication of the declaration char b="COMPUTER";?
When initializing an array explicitly at runtime, which method can be used in C?
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?
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?
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];?
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?
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?
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?
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};?
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?
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?
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?
What is the purpose of specifying the size of an array during its declaration?
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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];nindicates 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).
- Example:
-
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.
- Example:
-
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
scanfto 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];nindicates 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).
- Example:
-
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.
- Example:
-
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
scanfto 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];nindicates 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).
- Example:
-
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.
- Example:
-
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
scanfto 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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