模拟实现memcpy

最新推荐文章于 2025-05-07 10:13:42 发布

hy____123

最新推荐文章于 2025-05-07 10:13:42 发布

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文章标签：算法数据结构

本文链接：https://blog.youkuaiyun.com/hy____123/article/details/144828500

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//模拟实现memcpy
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
void* my_memcpy(void* dest, const void* str, size_t num)
{    
	void* p = dest;
	while (num--)
	{   //前向后
		*(char*)dest = *(char*)str;
		dest = (char*)dest + 1;
		str = (char*)str + 1;
	}
	return p;
}
int main()
{   
	int arr[10] = { 0 };
	int arr2[10] = {0,1,2,3,4,5,6,7,8,9 };
	my_memcpy(arr,arr2,20);
	for (int i = 0;i < 5;i++)
	{
		printf("%d ", arr[i]);
	}
	return 0;
}