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In this blog, we need the length of arrays for a variety of actions, including iterating over the array, copying the array, and more. In this post, we’ll look at the many ways to obtain an C array length.

The C array length is fixed and is stated in the declaration of the array. There is no built-in way to determine an array’s size in C. By using C’s built-in techniques or pointers, getting the array’s length requires a little bit of work. There are several approaches to determining C array length. Two methods will be examined in this article:

Thus, the reasoning would be as follows:

I’d want to ask you a query. Could you please provide the length of the following array?

//C sizeof array

You may respond to this question after spending some time on it, but if the array you get is 10 times as large as the one above, it will be challenging and time-consuming. Instead, consider why you would need to manually count the elements when the C language has the sizeof() operator.

So let me show you how to count C Array length of elements using the sizeof() operator.

In C, the sizeof() operator determines the size in bytes of any provided variables or datatypes. Since sizeof() cannot determine the array’s size directly, we must apply the programming logic outlined above to determine its length.

Syntax to calculate C array length using sizeof():

In the above syntax:

Let’s now examine why this algorithm for determining an array’s length is effective:

We divide the size of one array element by the number of array elements to determine the size of the entire array. We then divide the size of the entire array, sizeof(name of the C array), by the size of a single array element, sizeof(name of array[index]), to determine the length of the array. Consequently, we are given the array’s length.

Using sizeof(), a C program may determine the length of an integer array Let’s now have a look at a C program that uses the sizeof() operator to determine the length of an integer array.

Calculate the length of an array using the sizeof() operator in C language. Below is the code Implementation:

Output:

C Program to Calculate the Length of char Array Using sizeof() Let’s now have a look at a C program that uses the sizeof() operator to determine the length of a char array.

Using pointer arithmetic as a solution in C to get the length of an array. In comparison to the sizeof() operator, the approach is straightforward. The length of an array is calculated using the following expression:

Let’s look at some C programs to grasp this better:

Calculate the Length of int Array Using Pointer Arithmetic in C language Below is the code Implementation

Output

Calculate the Length of char Array Using Pointer Arithmetic in C language Below is the code Implementation

Output

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