17.复制字符串 ，包括\0

#include<stdio.h>
#include <cstring>int main(){int len1,len2;char s1[44];char s2[33];scanf("%s",s1);scanf("%s",s2);len1=strlen(s1)+1;printf("先s1的字符长度为：%d\n",len1) ;strcpy(s1,s2) ;printf("复制字符：%s\n ",s1); len2=strlen(s1)+1;printf("后s1的字符长度为：%d\n",len2) ;return 0;}