帮忙修改一下程序，我菜鸟一个

[映维网]

#include<iostream.h>
#include<string.h>
class jia
{
public:
jia(char stl[5]);
jia operator+(jia );
void show();
private:
char str[5];
};
jia::jia(char stl[5])
{
strcpy(str,stl);
}
jia jia::operator+(jia)
{
jia A,B;
return strcat(A.str,B.str);

}
void jia::show()
{
cout<<str<<endl;
}
void main()
{
jia A="abcd";
jia B="efgh";
A.show();
B.show();
(A+B).show();
}

[ryfdizuo]

//勉强是可以了，
#include <iostream> 
#include <string.h>
using namespace std;

class jia 
{ 
public: 
	jia(){}
	jia(char stl[5]); 
	jia operator+(jia ); 
	void show(); 
private: 
	char str[5]; 
}; 
jia::jia(char stl[5]) 
{ 
	strcpy(str,stl); 
} 
jia jia::operator+(jia) 
{ 
	jia A,B; 
	return strcat(A.str,B.str); 

} 
void jia::show() 
{ 
	cout <<str <<endl; 
} 
void main() 
{ 
	jia A="abcd"; 
	jia B="efgh"; 
	A.show(); 
	B.show(); 
	(A+B).show(); 
}

[lzy340623339]

#include <string.h> 
class jia 
{ 
public: 
   jia(char stl[5]); 
   char* operator+(jia B); 
   void show(); 
 private: 
char str[5]; 
}; 
jia::jia(char stl[5]) 
{ 
strcpy(str,stl); 
} 
char* jia::operator+(jia B) 
{ 
return strcat(str,B.str); 

} 
void jia::show() 
{ 
cout <<str <<endl; 
} 
void main() 
{ 
jia A("abcd"); 
jia B("efgh"); 
A.show(); 
B.show(); 
cout<<A+B<<endl; 
}

[HelloDan]

#include<iostream>
#include<string>
#include<cstring>

using namespace std;

class jia
{
public:
   jia(char *stl)
   {
     strncpy(str,stl,4);
     str[4]='\0';	 
   }
   //jia operator+(const jia & );
   void show();
 private:
char str[5];
};

/*
jia jia::operator+(jia) //这个你分配好空间了，不宜这样做。
{
jia A,B;
return strcat(A.str,B.str);

}
*/
void jia::show()
{
cout <<str <<endl;
}


int main()
{
jia A="abcd";
jia B="efgh";
A.show();
B.show();
//(A+B).show();

return 0;
}