C++超详细讲解函数对象_C 语言

#include <iostream>
using namespace std;
int fib()
{
    static int a0 = 0;
    static int a1 = 1;
    int ret = a1;
    a1 = a0 + a1;
    a0 = ret;
    return ret;
}
int main()
{
    for (int i = 0; i < 10; i++)
    {
        cout << fib() << endl;
    }
    cout << endl;
    for (int i = 0; i < 5; i++)
    {
        cout << fib() << endl;
    }
    return 0;
}

#include <iostream>
using namespace std;
class Fib
{
    int a0;
    int a1;
public:
    Fib()
    {
        a0 = 0;
        a1 = 1;
    }
    Fib(int n)
    {
        a0 = 0;
        a1 = 1;
        for (int i = 2; i <= n; i++)
        {
            int t = a1;
            a1 = a0 + a1;
            a0 = t;
        }
    }
    int operator () ()
    {
        int ret = a1;
        a1 = a0 + a1;
        a0 = ret;
        return ret;
    }
};
int main()
{
    Fib fib;
    for (int i = 0; i < 10; i++)
    {
        cout << fib() << endl;
    }
    for (int i = 0; i < 5; i++)
    {
        cout << fib() <<endl;
    }
    cout << endl;
    Fib fib2(10);
    for (int i = 0; i < 5; i++)
    {
        cout << fib2() << endl;
    }
    return 0;
}