a question of c++

MagicBoy · 发表于 2003-11-2 15:20:21

this is a c++ program.
#include <iostream.h>

class Hello{
public:
  char *s;
  Hello(){
strcmp(s,"hello,worls");
  }
  void Hello::print(){
cout << s << endl;
  }
};

int main()
{
  Hello *p;
  p -> print();
}

but the result isn't view.
why??? :-(

sjinny · 发表于 2003-11-2 20:27:07

汗~~~
类Hello中，变量s只是个指针，在你使用它保存字符串之前，得给分配一些内存。
Hello::print()也没有在类的定义中声明
没有使用STL里的字符串类也可以使用cout输出字符串吗？

_z_ · 发表于 2003-11-2 21:00:50

a lot of error

direstrait · 发表于 2003-11-2 21:04:03

版主说的对啊，不过COUT应该可以输出CHAR *类型的，不用STRING好像也没有什么吧

MagicBoy · 发表于 2003-11-2 21:52:10

my god,i want to died.
hi,Thanks for everyone!!!!

EdwardRF · 发表于 2003-11-4 12:13:03

[quote:0b83790a0c="MagicBoy"]this is a c++ program.
#include <iostream.h>

class Hello{
public:
  char *s;
  Hello(){
strcmp(s,"hello,worls");
  }
  void Hello::print(){
cout << s << endl;
  }
};

int main()
{
  Hello *p;
  p -> print();
}

but the result isn't view.
why??? :-([/quote]
[code:1]
#include <iostream> // try to use the c++ standard
using namespace std; // if you avoid this line you can always
                                 // replace cout with std::cout.
class Hello{
public:
  char s[20];
  Hello(){
// strcmp(s,"hello,worls");  ??? strcmp? compare the two string?
   strcpy(s,"hello world!");
  }
  void print();
};

// separate the class defination and class functions is a good idea.
// indeed you should put them in separate files.(.hpp and .cpp)

void Hello::print(){
cout << s << endl;
}

int main()
{
  Hello *p,a;
  p=&a;
  p -> print();
}[/code:1][/code]

MagicBoy · 发表于 2003-11-5 22:37:57

thanks you very much!!!

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a question of c++

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