OJ：重載 << 運算符

Description

補足程式，使得下麵程式輸出的結果是：

****100

#include <iostream>
#include <string>
using namespace std;
// Your Code Here
string Print1() 
{
    return "****";  
}
int Print2() 
{
    return 100; 
}

int main()
{
    cout << Print1 << Print2 << endl; 
    return 0;
}

Output

****100

解法如下：

#include <iostream>
#include <string>
using namespace std;

ostream& operator<<(ostream& out, string (*p)())
{
    out << (*p)();
    return out;
}

ostream& operator<<(ostream& out, int (*p)())
{
    out << (*p)();
    return out;
}

string Print1() 
{
    return "****";  
}
int Print2() 
{
    return 100; 
}

int main()
{
    cout << Print1 << Print2 << endl; 
    return 0;
}