Question 1

What is an array in C?

Accepted Answer

An array in C is a data structure that can store a fixed-size sequential collection of elements of the same type. It allows you to store multiple items of the same data type together.

Question 2

How do I declare an array in C?

Accepted Answer

To declare an array, specify the data type, the name of the array, and the size (number of elements). For example: int numbers[5]; declares an array of 5 integers.

Question 3

Can I change the size of an array after it's declared?

Accepted Answer

No, the size of an array in C is fixed once declared. If you need a dynamic size, consider using dynamic memory allocation with pointers.

Question 4

How are arrays stored in memory?

Accepted Answer

Arrays in C are stored in contiguous memory locations, meaning each element is stored directly after the previous one. This allows for efficient access using indices.

Question 5

What happens if I access an array element outside its bounds?

Accepted Answer

Accessing an element outside the bounds of an array (i.e., using an index greater than or equal to the size of the array) leads to undefined behavior, which could cause a program crash or corrupt data.

Question 6

How do I initialize an array in C?

Accepted Answer

You can initialize an array during declaration like this: int numbers[5] = {1, 2, 3, 4, 5};. If you initialize only some elements, the rest are set to 0 by default.

Question 7

Can I pass an array to a function in C?

Accepted Answer

Yes, you can pass an array to a function. However, since arrays are passed by reference, what is actually passed is the address of the first element, not the entire array.

Question 8

What is a multi-dimensional array?

Accepted Answer

A multi-dimensional array is an array of arrays. The most common type is a two-dimensional array, which can be visualized as a matrix with rows and columns.

Question 9

How do I determine the size of an array in C?

Accepted Answer

You can determine the size of an array by dividing the total size of the array by the size of one element: sizeof(array) / sizeof(array[0]). This gives you the number of elements in the array.

Question 10

What is the difference between an array and a pointer?

Accepted Answer

An array is a collection of elements, while a pointer is a variable that stores the address of another variable. Arrays can decay to pointers when passed to functions, but they are different in how they are used and manipulated in memory.

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