#include <stdio.h>

int main()
{	
	char name[20] = {0};    // 数组定义的时候需要初始化
	const char* s = "asadds";	 

	strncpy(name, s, strlen(s));  // 从s指针指向的内容中将长度为strlen（s）的字符串赋值到数组name中
	printf("s = %s\n name = %s\n s_len = %d\n name_len = %d\n",s, name, strlen(s), sizeof(name));
	return 0;
}

输出：

s = asadds
 name = asadds
 s_len = 6
 name_len = 20