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C stdlib free() 函数

❮ C stdlib 库


示例

使用完后释放内存

// Allocate memory for a number of items
int numItems = 15;
int *myArray = calloc(numItems, sizeof(int));

// Write into the memory
for(int i = 0; i < numItems; i++) {
  myArray[i] = i + 1;
}

// Display the contents of the memory
for(int i = 0; i < numItems; i++) {
  printf("%d ", myArray[i]);
}

// Free the memory
free(myArray);
myArray = NULL;
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定义和用法

The free() 函数释放动态分配的内存。动态内存是由 malloc()calloc()realloc() 函数分配的内存。

The free() 函数在 <stdlib.h> 头文件中定义。

要了解有关内存释放的更多信息,请参阅我们的 C 释放内存教程


语法

free(void * ptr);

参数值

参数 描述
ptr 指向一块动态内存的指针。

❮ C stdlib 库

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