Array C Programming MCQ Questions Quiz with Explanations

In C, array elements are accessed using array indexing, where the index is placed within square brackets after the array name (e.g., array[i]).

Creating an array typically involves a few steps:

1. Declaration: You declare the array by specifying its data type and name.
2. Allocation: You allocate memory space for the array, specifying its size or dimensions.
3. Initialization (optional): You can optionally initialize the elements of the array with specific values.

The string termination character, '\0' (NULL), signifies the end of a string in languages like C and C++. It terminates character arrays, aiding functions like `strlen()` in determining string length. '\0' is crucial for proper string processing, marking the endpoint in memory for string-handling operations.

In C, the maximum number of dimensions an array may have is theoretically unlimited, but practical limitations, such as available memory and compiler restrictions, often influence the actual limit. In practice, many compilers support arrays with several dimensions, but excessive dimensions can lead to issues like decreased performance or compilation errors.

1. Time: This refers to the amount of time an algorithm takes to complete its task. It measures how fast an algorithm executes, often in terms of the number of operations performed. Time complexity analysis helps understand how the runtime of an algorithm grows with the size of the input.
2. Space: Space complexity measures the amount of memory space an algorithm requires to solve a problem. It evaluates how much memory an algorithm needs in relation to the size of the input. Space complexity analysis helps determine the efficiency of memory usage by an algorithm.

In C, strings are represented in memory as arrays of characters (also known as character arrays). Each character in the string is stored in a consecutive memory location, with the first character being stored at the lowest memory address and the last character being stored at the highest memory address.

In C, the 'break' keyword can be used within switch blocks and loops (for, while, and do-while). It allows you to exit the loop or switch statement prematurely based on certain conditions. Therefore, 'break' is a valid construct in both switch blocks and loops.

The type of array used to store tabular data in the form of rows and columns is a **two-dimensional array** (2D array). This array structure allows data to be organized in rows and columns, creating a grid-like structure similar to a table. Each element in a 2D array is accessed using two indices: one for the row and one for the column.

When you declare an array without initialization, you are essentially telling the compiler about the existence of the array and its type, but you're not allocating memory or creating the array object itself.

int[] numbers;

The size of an array in C is calculated by multiplying the size of each element by the total number of elements in the array.

Size = size of one element * total number of elements

1-D arrays are typically initialized using a comma `,` to separate values of data elements, and the values are enclosed within curly braces `{}`.

A 1-D array of characters can be considered as a string. In many programming languages, a string is essentially an array of characters. This allows for the representation and manipulation of textual data as a sequence of characters stored in contiguous memory locations. The elements of the array are individual characters that form the string.

Traversal refers to the process of accessing or visiting each element in a data structure, such as a list, array, or tree, typically in a sequential manner. It involves iterating through the elements of the data structure and performing some operation on each element, such as reading, updating, or deleting. Traversal is a fundamental operation in many algorithms and is used for tasks like searching, sorting, and analyzing data.

Arrays are accessed sequentially because elements are stored in contiguous memory locations, allowing for efficient retrieval by incrementing memory addresses.

To declare a 1-D array, we use a pair of square brackets (`[]`) after the array name or after the data type, depending on the programming language syntax.

The `return` keyword is commonly used to exit from recursion in C and many other programming languages. It allows the current recursive function call to return a value and terminate, thus effectively ending the recursion.

In Java, array indices start from 0. Therefore, if you have the array `marks` defined as `int marks[] = {1, 2, 3, 4, 5};`, the value of `marks[3]` will be `4`.

Here's how the array looks:

- `marks[0]` is `1`
- `marks[1]` is `2`
- `marks[2]` is `3`
- `marks[3]` is `4`
- `marks[4]` is `5`

However, for a C program to be functional and achieve its intended purpose, it typically contains at least one function. This function is often named main() and serves as the entry point of the program. From main(), other functions can be called as needed to perform various tasks.

In the declaration int marks[] = new int[5];, the array marks has been initialized with a size of 5. However, in most programming languages, arrays are zero-indexed, meaning the first element is at index 0, and the last element is at index size - 1.

Arrays, on the other hand, are not considered primitive data structures. Arrays are collections of elements, and they can be composed of primitive data types, objects, or other arrays. They are typically used to store a fixed-size sequential collection of elements of the same type. However, arrays themselves are not considered primitive data structures because they are composed of elements and require memory allocation for their storage.

The NULL character, represented as '\0' or ASCII 0, marks the end of a string in programming languages like C. It signals to functions that operate on strings that the string concludes at that point in memory.

A double-subscripted array declared as int a[3][5]; has a total of 3 * 5 = 15 elements.

An array is a data structure that stores a collection of elements of the same data type, arranged in contiguous memory locations and accessed using an index or key. It's commonly used for organizing and manipulating data in programming.

Array is an example of **static** type memory allocation. In static memory allocation, memory is allocated at compile time, and the size of the memory block remains constant throughout the program's execution. Arrays in languages like C and C++ are statically allocated, meaning that the size and type of the array are determined at compile time, and memory is allocated accordingly.

In the array declaration `sales[5][12]`, `5` represents the size of the first dimension (rows) and `12` represents the size of the second dimension (columns). Therefore, the size of the second dimension in the array `sales[5][12]` is `12`.

Arrays can typically be created in the following ways:

Declaration with initialization.
Declaration with a specified size.
Using literal notation.
Using array constructors.
Dynamic memory allocation.
Collection initializers (in some languages).

In the C programming language, curly braces `{}` are used to signify the start and end of a block of code. These curly braces are used for defining functions, loops, conditional statements, and other program constructs where a block of code is required.

Explanation: int arr[] = {1,2,3}; In this case size of array need not to be specified when initialization is a part of defination.

a) LOC(Array[5]) = Base(Array) + w * (5 - lower bound)

Here's a breakdown of the components:

• Base(Array): Represents the base address of the array, i.e., the memory address of the first element.
• w: Denotes the size (in bytes) of each array element.
• 5 - lower bound: Calculates the difference between the index of the element you want to access (5 in this case) and the lower bound of the array index.

The memory address of the first element of an array is called the "base address." It serves as the starting point from which the locations of other elements in the array are calculated, based on their indices and the size of each element.

Arrays are used in programming for efficient storage, sequential and random access to elements, sorting, searching, handling multi-dimensional data, memory efficiency, and performance optimization.

When you have an array in programming, each element in the array is stored at a specific index position. The index is like an address that helps you locate and access a particular element within the array. The index positions typically start from 0 for the first element, 1 for the second element, and so on.

The disadvantages of arrays in brief:

1. Fixed size limits dynamic resizing.
2. Memory wastage when allocated size exceeds actual need.
3. Lack of dynamic resizing capabilities.
4. Requires contiguous memory allocation.
5. Inefficient insertions and deletions.
6. Limited flexibility compared to other data structures.