#include
#include
int main()
{
char arr[]="hellow";
int len =strlen(arr);
printf("字符串的有效长度是:%dn",len);
printf("字符串的长度是:%d",sizeof(arr));
return 0;
}

#include
#include
int main()
{
char arr[]="hellow";
int len =strlen(arr);
printf("字符串的有效长度是:%dn",len);
printf("字符串的长度是:%d",sizeof(arr));
return 0;
}