#include <stdio.h>
#include <string.h>
// 字符串以\0结尾
int main(){
char str1[] = "I Can Eat Glass";
char str2[20] = "I Can Eat Glass";
printf("str1:%s\nsize:%lu\nstr2:%s\nsize:%lu\n",\
str1,strlen(str1),str2,strlen(str2));
}