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Most people don't understand the knowledge points of this article "how to use realloc function in c language", so Xiaobian summarizes the following contents for everyone. The contents are detailed, the steps are clear, and they have certain reference value. I hope everyone can gain something after reading this article. Let's take a look at this article "how to use realloc function in c language".

Determine whether the current pointer has enough continuous space. If enough, enlarge the address ptr points to and return it.

If not, how to allocate space according to the size specified by size, copy the original data into the newly allocated memory, and then free the area pointed to by the original ptr.

After using memory, you should use the free() function to release, but the original pointer is automatically released, without using free.

examples

#include #include int main(){ char *str; /* initial memory allocation */str = (char *)malloc(15);strcpy(str, "Hello World! "); printf ("String = %s\n", str); /* reallocate memory */str = (char *)realloc(str, 25);strcat (str, ", C");printf ("String = %s\n", str); free(str);system("pause");return 0;} The above is about the content of this article on "how to use realloc function in c language", I believe everyone has a certain understanding, I hope the content shared by Xiaobian is helpful to everyone, if you want to know more related knowledge content, please pay attention to the industry information channel.

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