"C-Language Summary" dynamic assignment

Dynamic Storage Allocation allocation function

malloc function-allocates a block of memory, but does not initialize a block of memory
Calloc function--allocates memory blocks. And the memory block is cleared
ReAlloc function-Adjusts the previously allocated block of memory
The free function ——-release allocated memory

Dynamically allocating strings

char *p;p = (char *)malloc1);//给具有n个字符的字符串分配空间；p指向未初始化的字符数组strcpy"abc")；//给p赋值；

Dynamically allocating arrays

//使用malloc分配intmallocsizeof(int))；//使用calloc分配intcallocsizeof(int));//并且每个元素都初始化为0

Freeing memory

free(p);//释放掉p所指的内存

"C-Language Summary" dynamic assignment