#include<iostream>
using namespace std;
class complex_number
{
public: int x,*ptr;
ostream & operator <<(ostream &out, complex_number &c)
{
out<<"size="<<c.x<<endl;
for(int i=0;i<c.x;i++)
out<<c.ptr[i]<<" ";
out<<"\n";
return out;
}
complex_number(int a)
{
x=a;
ptr=(int *) malloc(a*sizeof(int));
for(int i=0;i<5;i++)
ptr[i]=i;
}
};
int main()
{
complex_number p(5);
cout<<p;
}
above code show error "operator << must take only one argument"
and when i change code to
#include<iostream>
using namespace std;
class complex_number
{
public: int x,*ptr;
friend ostream & operator <<(ostream &out, complex_number &c);
complex_number(int a)
{
x=a;
ptr=(int *) malloc(a*sizeof(int));
for(int i=0;i<5;i++)
ptr[i]=i;
}
};
ostream & operator <<(ostream &out, complex_number &c)
{
out<<"size="<<c.x<<endl;
for(int i=0;i<c.x;i++)
out<<c.ptr[i]<<" ";
out<<"\n";
return out;
}
int main()
{
complex_number p(5);
cout<<p;
}
then there is no error why so...?
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