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The C language is effective plenty of to deal with its memory administration. It usually means that when you declare a regular variable of any details sort in C, the programming language by itself is dependable for deallocating or releasing this memory after your plan has been executed efficiently. Nevertheless, in the situation of dynamic memory allocation, due to the fact you are allocating the memory manually, that is why you also have to launch it on your very own.

In the “stdlib.h” library, there is a committed functionality for serving this reason, i.e., the “free()” purpose. Currently, we will discover the need to use this perform in the C programming language. After that, we will glimpse at a number of examples in which this operate has been made use of to totally free up the memory manually in the C programming language in Linux.

Need of using the Absolutely free Operate in C for Releasing up Process Memory:

We all know that our laptop systems have restricted memory, mainly because of which we can in no way run infinite packages in it. In the case of computerized memory allocation, the laptop requires treatment of freeing up the memory when your program has finished its execution. However, when we allocate the memory manually from the heap, we have to absolutely free it from one particular way or one more.

In any other case, we will finally run limited of memory, and we will not run our programs any additional. This is wherever the “free()” purpose of the “stdlib.h” library will come into enjoy. We use this perform at the stop of a method suitable right before the “return” assertion so that the heap memory should really be returned to the laptop technique ahead of the termination of your plan.

Suppose you will keep disregarding this purpose though composing your C codes that are specially specific toward dynamic memory allocation. In that case, a position will arrive when you can not accessibility your heap any more given that it will operate out of memory. That is why this seemingly much less useful functionality ought to under no circumstances be overlooked whenever you are taking the responsibility of memory allocation dynamically.

The basic syntax of the “free()” operate in the C programming language is as follows:

In this article, the “void” search phrase ahead of the “free()” perform states that the return form of this perform is void. The pointer within the brackets corresponds to the memory site that wants to be deallocated. The adhering to area will describe some illustrations in which the “free()” perform has been made use of for releasing the dynamic memory obtained in C.

Examples of Applying the Cost-free Function in C:

The “free()” purpose can be utilised with all the three memory allocation capabilities of the “stdlib.h” library, i.e., “malloc,” “calloc,” and “realloc.” It is obligatory to use this function immediately after stating the simple operation of your plan so that you can hand in excess of the heap memory that you have dynamically allotted through the software execution back again to your personal computer process. Now, permit us acquire a search at a couple examples in which the “free()” purpose has been utilised with the “malloc” and “calloc” features in the C programming language.

Illustration # 1: Using the Totally free Perform with “calloc” in C:

The C code for employing the “free()” perform with the “calloc()” purpose has been shared in the picture down below:

The basic purpose of this code was to assign some memory dynamically with the aid of the “calloc()” functionality. For that, we have taken the dimension of the dynamic memory and the values of this dynamic memory as enter from the person. Then, we meant to print the acquired values on the terminal. Following this whole code, we have our “free()” functionality that will launch the allocated dynamic memory thanks to the execution of our C application.

A a little modified version of the identical code is also demonstrated in the picture cited underneath:

This modified edition only intended to print our dynamically allocated memory values prior to its manual initialization. We know that the “calloc()” purpose initializes the complete memory with zeros before the actualization happens. However, the primary level to be famous about below in this code is that even nevertheless this code was very compact and straightforward, we even now created use of the “free()” purpose when the sought after performance was reached just to release the heap memory that we had obtained as a result of executing this C system.

Illustration # 2: Employing the Free Perform with “malloc” in C:

The C code for employing the “free()” operate with the “malloc()” operate has been shared in the image appended down below:

The essential reason of this code was to assign some memory dynamically with the support of the “malloc()” function. For that, we have assigned the values of this dynamic memory in a “for” loop. Then, we meant to print the acquired values on the terminal with the aid of another “for” loop. Soon after this entire code, we have our “free()” functionality proper before the “return” statement that will only launch the allotted dynamic memory as a end result of the execution of our C method.


This post emphasised the importance of using the “free()” function in the C programming language in Linux. Most of the consumers believe that that the allocation capabilities of the “stdlib.h” file are extra significant nevertheless, by likely by way of this article, you can evidently see that the “free()” functionality is similarly significant. It will enable you release the dynamically acquired memory and make certain that you under no circumstances run out of memory anytime you try to execute your systems in the potential.

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