这个程序应该如何改？
#include <iostream>#include <string>
#include <cstring>
using namespace std;
class MyString {
char * p;
public:
MyString(const char * s) {
if( s) {
p = new char[strlen(s) + 1];
strcpy(p,s);
}
else
p = NULL;
}
~MyString() { if(p) delete [] p; }
/* MyString & operator = (const char *w)
{
delete [] p;
p=new char[strlen(w)+1];
strcpy(p,w);
return *this;
}
void Copy(char *s)
{
delete [] p;
p=new char[strlen(s)+1];
strcpy(p,s);
}
friend ostream & operator << (ostream & o,const MyString & s);
ostream & operator << (ostream & o,const MyString & s)
{
o<<s.p;
return o;
}
注释部分，是我修改部分，编译时候出现错误，应该如何修改呢？
ostream & operator << (ostream & o,const MyString & s) 报错
[Error] 'std::ostream& MyString::operator<<(std::ostream&, const MyString&)' must take exactly one argument
*/
};
int main()
{
char w1[200],w2[100];
while( cin >> w1 >> w2) {
MyString s1(w1),s2 = s1;
MyString s3(NULL);
s3.Copy(w1);
cout << s1 << "," << s2 << "," << s3 << endl;
s2 = w2;
s3 = s2;
s1 = s3;
cout << s1 << "," << s2 << "," << s3 << endl;
}
}
输入
多组数据，每组一行，是两个不带空格的字符串
输出
对每组数据，先输出一行，打印输入中的第一个字符串三次
然后再输出一行，打印输入中的第二个字符串三次
样例输入
abc def
123 456
样例输出
abc,abc,abc
def,def,def
123,123,123
456,456,456
[此贴子已经被作者于2017-10-4 14:40编辑过]
