iostream

#include<stdio.h>
class MyOutStream
{
public:
    const MyOutStream & operator <<(int value) const;
    const MyOutStream & operator <<(char *value) const;

};

const MyOutStream &MyOutStream::operator <<(int value) const
{
    printf("%d",value);
    return *this;

}
const MyOutStream &MyOutStream::operator <<(char *value) const
{
    printf("%s",value);
    return *this;
}
MyOutStream myout;
int main ()
{
    int a=2008;
    char *str="hello world";
    myout<<str<<"\n";
    myout<<a;
    return 0;
}

      

自己编写stream类看看cout 不是函数而是对象