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This article mainly introduces "how to use dynamic arrays in C language". In daily operation, I believe that many people have doubts about how to use dynamic arrays in C language. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about how to use dynamic arrays in C language! Next, please follow the editor to study!

Dynamic array, as opposed to static array. The length of the static array is predefined and cannot be changed once the size is given throughout the program. This is not the case with dynamic arrays, which can be resized as needed by the program. The memory space of a dynamic array is allocated (that is, dynamically allocated) from the heap. It allocates storage space by executing the code. These statements are allocated only when the program executes them. The programmer is responsible for freeing memory himself.

Why use dynamic arrays?

In actual programming, it often happens that the memory space required depends on the actual input data and cannot be determined in advance. It is difficult to solve this problem with static arrays. In order to solve the above problems, C language provides some memory management functions, which, combined with pointers, can dynamically allocate memory space as needed to build a dynamic array, and can also recycle the space that is no longer used for use. it provides a means to make effective use of memory resources.

Comparison between dynamic array and static array

For static arrays, it is easy to create, no need to release after use, and easy to reference, but not being able to change its size after creation is its Achilles' heel!

For dynamic arrays, it is troublesome to create and must be released by the programmer after use, otherwise it will seriously cause memory leaks. But its use is very flexible, and the size can be dynamically allocated according to the needs of the program.

How to build dynamic arrays

Follow the principle

Apply from the outer layer to the inner layer, layer by layer

Release from the inner layer to the outer layer, layer by layer.

Build the required pointer

For building an one-dimensional dynamic array, you need an one-dimensional pointer

For two-dimensional, you need one-dimensional, two-dimensional pointers.

Three-dimensional requires one, two, three-dimensional pointer.

And so on.

In actual programming, it often happens that the memory space required depends on the actual input data and cannot be determined in advance. It is difficult to solve this problem with static arrays. In order to solve the above problems, C language provides some memory management functions, which, combined with pointers, can dynamically allocate memory space as needed to build a dynamic array, and can also recycle the space that is no longer used for use. it provides a means to make effective use of memory resources.

At this point, the study on "how to use dynamic arrays in C language" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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