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Questions and Answers
Which of the following best describes an array in C programming?
Which of the following best describes an array in C programming?
- A data structure that stores multiple elements of the same data type in a contiguous block of memory. (correct)
- A data structure that stores multiple elements of the same data type in a non-contiguous block of memory.
- A data structure that stores a single element of any data type.
- A data structure that stores elements of different data types.
Given the following C code, what is the index of the last element in the numbers
array?
int numbers[5];
Given the following C code, what is the index of the last element in the numbers
array?
int numbers[5];
- 0
- 4 (correct)
- 5
- 1
Which of the following code snippets correctly declares a one-dimensional array of integers named scores
with a size of 10?
Which of the following code snippets correctly declares a one-dimensional array of integers named scores
with a size of 10?
- `int scores = array[10];`
- `int scores[10];` (correct)
- `int scores(10);`
- `array scores[10];`
In C, how can you access the third element of an array named data
?
In C, how can you access the third element of an array named data
?
Given the array int values[3] = {5, 10, 15};
, what is the value of values[1]
?
Given the array int values[3] = {5, 10, 15};
, what is the value of values[1]
?
Which of the following statements correctly modifies the first element of an array named myArray
to the value 25?
Which of the following statements correctly modifies the first element of an array named myArray
to the value 25?
What does 'traversing an array' mean in C programming?
What does 'traversing an array' mean in C programming?
Which type of loop is most commonly used for traversing arrays in C, allowing specification of start, end, and increment?
Which type of loop is most commonly used for traversing arrays in C, allowing specification of start, end, and increment?
Given the following code, what will be printed to the console?
int numbers[5] = {10, 20, 30, 40, 50};
for (int i = 0; i < 5; i++) {
printf("%d ", numbers[i]);
}
Given the following code, what will be printed to the console?
int numbers[5] = {10, 20, 30, 40, 50};
for (int i = 0; i < 5; i++) {
printf("%d ", numbers[i]);
}
To create a two-dimensional array called matrix
with 3 rows and 5 columns, which of the following C code snippets is correct?
To create a two-dimensional array called matrix
with 3 rows and 5 columns, which of the following C code snippets is correct?
In a two-dimensional array grid[4][6]
, how would you access the element in the 2nd row and 4th column?
In a two-dimensional array grid[4][6]
, how would you access the element in the 2nd row and 4th column?
Given the 2D array int table[2][3] = {{1, 2, 3}, {4, 5, 6}};
, what value will table[1][0]
return?
Given the 2D array int table[2][3] = {{1, 2, 3}, {4, 5, 6}};
, what value will table[1][0]
return?
Given the two-dimensional array arrayName[rowIndex][columnIndex]
, what do rowIndex
and columnIndex
represent?
Given the two-dimensional array arrayName[rowIndex][columnIndex]
, what do rowIndex
and columnIndex
represent?
Which code snippet shows the correct way to assign the value 15 to the element in the first row and second column of a 2D array named matrix
?
Which code snippet shows the correct way to assign the value 15 to the element in the first row and second column of a 2D array named matrix
?
What is the primary purpose of multi-dimensional arrays in C programming?
What is the primary purpose of multi-dimensional arrays in C programming?
How can nested loops be used to traverse a 2D array?
How can nested loops be used to traverse a 2D array?
Which of the following best defines 'array traversal'?
Which of the following best defines 'array traversal'?
Which loop is most appropriate when you need to traverse an array and have a specific condition for terminating the loop?
Which loop is most appropriate when you need to traverse an array and have a specific condition for terminating the loop?
Which of the following operations can be performed during array traversal?
Which of the following operations can be performed during array traversal?
Given the array int numbers[] = {1, 2, 3, 4, 5};
, which of the following loops correctly calculates the sum of all elements?
Given the array int numbers[] = {1, 2, 3, 4, 5};
, which of the following loops correctly calculates the sum of all elements?
What is the primary difference between traversing a one-dimensional array and a multi-dimensional array?
What is the primary difference between traversing a one-dimensional array and a multi-dimensional array?
How many indices are required to identify each element in a three-dimensional array?
How many indices are required to identify each element in a three-dimensional array?
What is the main purpose of a structure in C programming?
What is the main purpose of a structure in C programming?
Which keyword is used to define a structure in C?
Which keyword is used to define a structure in C?
Given the structure below, how would you declare a variable (or instance) of the structure?
struct Point {
int x;
int y;
};
Given the structure below, how would you declare a variable (or instance) of the structure?
struct Point {
int x;
int y;
};
If you create an instance of a structure without initializing its members, what will the members contain?
If you create an instance of a structure without initializing its members, what will the members contain?
What operator is used to access the members of a structure in C?
What operator is used to access the members of a structure in C?
Given the structure and variable:
struct Book {
char title[50];
float price;
};
struct Book myBook;
How would you assign the price of myBook
to 29.99?
Given the structure and variable:
struct Book {
char title[50];
float price;
};
struct Book myBook;
How would you assign the price of myBook
to 29.99?
When a structure is passed by value to a function, what happens to the original structure in the calling code?
When a structure is passed by value to a function, what happens to the original structure in the calling code?
How can you modify structure members within a function and have the changes reflected in the calling code?
How can you modify structure members within a function and have the changes reflected in the calling code?
Which of the following is the correct way to pass a structure myStruct
by reference to a function in C?
Which of the following is the correct way to pass a structure myStruct
by reference to a function in C?
What is a pointer in C?
What is a pointer in C?
Which symbol is used to declare a pointer variable in C?
Which symbol is used to declare a pointer variable in C?
What does the address-of operator (&) do in C?
What does the address-of operator (&) do in C?
Consider the following code. What will be the output?
int num = 10;
int *ptr = #
printf("%d\n", *ptr);
Consider the following code. What will be the output?
int num = 10;
int *ptr = #
printf("%d\n", *ptr);
Which operator is used to access the value stored at the memory address pointed to by a pointer?
Which operator is used to access the value stored at the memory address pointed to by a pointer?
Given the code:
int num = 5;
int *ptr = #
*ptr = 20;
What is the value of num
after the execution of this code?
Given the code:
int num = 5;
int *ptr = #
*ptr = 20;
What is the value of num
after the execution of this code?
In C, what does 'passing a variable by reference' using pointers achieve?
In C, what does 'passing a variable by reference' using pointers achieve?
If int *ptr
is passed as a parameter to a function, how can you modify the original variable that ptr
points to?
If int *ptr
is passed as a parameter to a function, how can you modify the original variable that ptr
points to?
What is the purpose of the switch
statement in C?
What is the purpose of the switch
statement in C?
Which keyword is used to specify a specific value to match in a switch
statement?
Which keyword is used to specify a specific value to match in a switch
statement?
What happens if a break
statement is omitted from a case
block in a switch
statement?
What happens if a break
statement is omitted from a case
block in a switch
statement?
In a switch
statement, what is the purpose of the default
label?
In a switch
statement, what is the purpose of the default
label?
Flashcards
What is an array in C?
What is an array in C?
A data structure to store multiple elements of the same type in a contiguous block of memory.
What are one-dimensional arrays?
What are one-dimensional arrays?
Simplest form of arrays, providing convenient storage and manipulation of data collections.
How do you create a one-dimensional array in C?
How do you create a one-dimensional array in C?
Declare the data type, array name, and specify the number of elements (arraySize).
What does 'type' represent in array declaration?
What does 'type' represent in array declaration?
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What is the 'arrayName' in array declaration?
What is the 'arrayName' in array declaration?
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What does 'arraySize' indicate in an array?
What does 'arraySize' indicate in an array?
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How to manipulate one-dimensional arrays?
How to manipulate one-dimensional arrays?
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What does 'arrayName' represent when accessing array elements?
What does 'arrayName' represent when accessing array elements?
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What does 'index' represent when accessing array elements?
What does 'index' represent when accessing array elements?
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How to modify array elements?
How to modify array elements?
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What does 'newValue' represent?
What does 'newValue' represent?
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What is Array Traversal?
What is Array Traversal?
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What is a multi-dimensional array?
What is a multi-dimensional array?
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Creating multi-dimensional arrays
Creating multi-dimensional arrays
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What do rowSize and columnSize represent?
What do rowSize and columnSize represent?
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How to access multi-dimensional arrays?
How to access multi-dimensional arrays?
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What are 'Structures' in C?
What are 'Structures' in C?
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How do you creating instance of a structure?
How do you creating instance of a structure?
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Accessing Structure Members
Accessing Structure Members
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Passing Structures by Value
Passing Structures by Value
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Passing Structures by Reference
Passing Structures by Reference
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What are Pointers?
What are Pointers?
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Defining Pointers
Defining Pointers
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How to declare pointer variables
How to declare pointer variables
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How to initialize a Pointer
How to initialize a Pointer
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How to access values through pointers?
How to access values through pointers?
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Passing Variables by reference
Passing Variables by reference
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Modifying Numbers via pointer Parameter
Modifying Numbers via pointer Parameter
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What is the switch statement?
What is the switch statement?
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What is switch a good alternative?
What is switch a good alternative?
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What is 'default' in switch?
What is 'default' in switch?
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Describing Switch Statement
Describing Switch Statement
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Study Notes
- An array in C is a data structure that stores multiple elements of the same type in a contiguous memory block.
- One-dimensional arrays represent the simplest array form for storing and manipulating data collections.
Creating One-Dimensional Arrays
- To create an array, declare it and specify its size
- The syntax is type arrayName[arraySize];
- type is the data type of the elements
- arrayName is the array name
- arraySize is the number of elements the array holds
- Example: To create an integer array named numbers to hold 5 elements, use int numbers;
Manipulating One-Dimensional Arrays
- Array elements can be manipulated by accessing them through their indices
- Array indices begin at 0 for the first element, and go to arraySize - 1
Accessing Array Elements
- Syntax for accessing array elements is arrayName[index];
- arrayName is the name of the array
- index is the element's position
- Example: To access the first element of the numbers array, use int firstElement = numbers;
Modifying Array Elements
- Array element values can be modified by assigning new values
- The syntax to modify an element is arrayName[index] = newValue;
- arrayName is the name of the array
- index is the position of the element to modify
- newValue is the value to assign
- To change the second element of the numbers array to 10, use numbers = 10;
Traversing One-Dimensional Arrays
- Traversing accesses and processes each array element
- Loops can iterate over array elements and perform operations on them
- Example: Print elements of numbers array using a for loop: C/C++
for (int i = 0; i < 5; i++) {
printf("%d ", numbers[i]);
}
- A loop starts at index 0 and continues to index 4
- The printf statement prints each array element to the console
Examples of Code Snippets
- To declare an integer array: C/C++
int numbers;
- To assign a value to the first element C/C++
numbers = 10;
- To assign a value to the second element C/C++
numbers = 20;
- To Access and perform operations on array elements: C/C++
int sum = numbers + numbers;
- To output the sum of the first and second elements: C/C++
printf("Sum: %d\n", sum);
Explanation of Array Code
- #include directive: includes the library so the printf function can display output
- main function: Entry point of a C program
- Declaration of the numbers integer array: In the main function, the integer array numbers of size 5 is declared
- Assignment of values: Values 10 and 20 are assigned to the first and second elements of the array, respectively.
- Addition: The addition of the first and second elements is performed and stored in a variable called sum
- Printf function: Used to display the value of sum.
More Examples
- To declare and initialize an integer array C/C++
int numbers = {10, 20, 30, 40, 50};
- To Print each array element in a for loop: C/C++
for (int i = 0; i < 5; i++) {
printf("%d ", numbers[i]);
}
- Print a new line after printing all elements: C/C++
printf("\n");
- The code uses a for loop to iterate over the array with an index from 0-4
- printf is used to print each array element using the format specifier %d
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