CHAPTER 10:EX 02_templatize the fibonacci( ) function on the type o-优快云博客

本文介绍了一个C++函数，该函数能够按需生成斐波那契数列中的下一个值，并提供了一个重置功能来重新开始数列。通过静态变量记录状态，在main函数中演示了如何使用此功能。

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/*
2. Create a function that returns the next value in a
Fibonacci sequence every time you call it. Add an
argument that is a bool with a default value of false such
that when you give the argument with true it “resets” the
function to the beginning of the Fibonacci sequence.
Exercise this function in main( ).
*/

#include<iostream>
using namespace std;

int Fibonacci(bool flag = false) {
    static int count = 1;
    static int num1 = 1;
    static int num2 = 1;
    if (flag)
        count = 0;
    if (count++ == 0) {
        num1 = 1;
        num2 = 1;
    }
    if (count++ == 1)
       return num1;
    else if (count++ == 2)
        return num2;
    else {
        num2 = num1 + num2;
        num1 = num2 - num1;
        return num2;
    }
}

int main() {
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci() << endl;
    cout << Fibonacci(true) << endl;
    cin.get();
}