模拟实现strncpy

//模拟实现strncpy
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
char* my_strncpy(char* dest, const char* sour, size_t num)
{
	int i = 0;
	char* ret = dest;
	for (i = 0;i < num;i++)
	{
		*dest = *sour;
		dest++;
		sour++;
	}
	return ret;
}
int main()
{   
	char arr1[10] = "abcdef";
	char arr2[10] = "";
	char* p=my_strncpy(arr2,arr1,4);
	printf("%s", p);
	return 0;
}