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C stdlib malloc() 函数

❮ C stdlib 库


示例

分配内存并读取其内容

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

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

// Free the memory
free(myArray);
myArray = NULL;
自己尝试 »

定义和用法

The malloc() 函数分配内存并返回指向它的指针。与 calloc() 不同,内存没有被初始化,所以值是不可预测的。

The malloc() 函数定义在 <stdlib.h> 头文件中。

要了解更多关于内存分配的信息,请查看我们的 C 内存管理教程.


语法

malloc(size_t size);

The size_t 数据类型是一个非负整数。

参数值

参数 描述
size 指定要分配的内存字节数。

技术细节

返回值 A void * 指针指向新分配的内存块。

❮ C stdlib 库

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