C++实现memcpy和memmove（含调试程序）

#include <iostream>
#include <string>
using std::cout;
using std::endl;

void* mymencpy(void* dest, void* src, size_t num) {
	char* d = (char*)dest;
	char* s = (char*)src;
	while (num--) {
		*(d++) = *(s++);
	}
	return d;
}

void* mymenmove(void* dest, void* src, size_t num) {
	char* d = (char*)dest;
	char* s = (char*)src;
	if (s > d) {
		while (num--) {
			*(d++) = *(s++);
		}
	}
	else {
		d += num - 1;
		s += num - 1;
		while (num--)
		{
			*(d--) = *(s--);
		}
	}
	return d;
}

int main() {
	int a[] = { 1,2,3,4,5 };
	int b[5];
	//mymencpy(a+1, a, 16);
	mymenmove(a + 1, a, 16);
	for (auto s : a) {
		cout << s;
	}
	cout << endl;
}

参考博客：memmove 和 memcpy的区别以及处理内存重叠问题