C++ 抛硬币程序错误

我正在尝试计算抛硬币中连续的正面朝上的次数。不幸的是，我的连续头计数器没有正确增加。有任何想法吗？代码和示例输出如下：

#include <iostream>
#include <string>
#include "random.h"
using namespace std;

string FlipCoin (string flip);


int main() {
    string flip;
    int consecutiveHeads = 0;
    int totalFlips = 0;
    while (consecutiveHeads<3) {
        totalFlips++;
        if (FlipCoin(flip) == "heads") {
           consecutiveHeads++;
        } else {
            consecutiveHeads = 0;
        }
        cout <<totalFlips<<" "<< FlipCoin(flip) << " " << consecutiveHeads <<endl;
    }
    cout <<"It took "<< totalFlips <<" coin flips to get 3 consecutive heads."<< endl;
    return 0;
}


string FlipCoin(string flip) {
    if (randomChance(0.50)) {
        return "heads";
    } else {
        return "tails";
    }
}

Output:

1 heads 1
2 tails 0
3 tails 1
4 heads 2
5 heads 3
It took 5 coin flips to get 3 consecutive heads.

每次致电FlipCoin(flip)生成一个新的随机数。您调用它两次，因此它会生成两个不同的随机数。你应该打电话FlipCoin(flip)一次并将其存储在变量中。

...
string result = FlipCoin(flip);
if (result == "heads") {
    consecutiveHeads++;
} else
    consecutiveHeads = 0;
}
cout <<"It took "<< totalFlips <<" coin flips to get 3 consecutive heads."<< endl;
...

正如其他人提到的，flip你的变量main未初始化且未使用。最好将其删除。建议你通过flip作为你的参考FlipCoin函数（使用&）。这绝对有用途，但不是必需的。最简单的修改可能是：

string FlipCoin() {
    if (randomChance(0.50)) {
        return "heads";
    } else {
        return "tails";
    }
}

PS：如果删除flip来自函数的参数，您还必须替换每次出现的FlipCoin(flip); with FlipCoin();