#include <iostream>
#include <string>
using namespace std;
int main()
{
string str;
str = "Good";
str += ' ';
str += "afternoon!";
string::iterator it;
it = str.begin();
while( it != str.end() ){
cout<<*it;
it++;
}
cout<<endl;
string::reverse_iterator rit;
rit = str.rbegin();
while( rit != str.rend() ){
cout<<*rit;
rit++;
}
cout<<endl;
return 0;
}

中的str函数都是什么意思,谢谢

C++中类的封装，都封装在STD里面

哦，看错了
STR是你定义的字符串
STRING在C++中是新字符串类不是C中的哪个，C中的是用CSTRING取代了

#include <iostream>
#include <string>

using namespace std;

int main()
{
string str; // str为空字符串
str = "Good"; // 将Good写入str
str += ' '; //在Good后加空格
str += "afternoon!"; //在空格后加afternoon!
string::iterator it; //声明正向迭代器it
it = str.begin(); //it指向字符串str的起始位置

while( it != str.end() ) //当it指向字符串str的末尾时,循环结束

{
cout<<*it; //输出str: Good afternoon!
it++;
}

cout<<endl;
string::reverse_iterator rit; //声明反向迭代器it
rit = str.rbegin();
while( rit != str.rend() )
{
cout<<*rit; //输出str:!noonretfa dooG
rit++;
}
cout<<endl;

system("pause"); //查看输出结果

return 0;
}

[此贴子已经被作者于2006-3-17 22:30:03编辑过]