99瓶啤酒在墙上使用布尔方法[关闭]

Question

你好，我正在尝试从这个 bool 方法中提取这个 cout 对话框。我希望能够输入瓶子的初始数量，然后调用布尔方法来确定它是否在范围内。如果为真，它将返回布尔方法中的对话，如果不是，它将要求用户再次输入金额。以下是我到目前为止的内容，但我非常困惑。

bool bottleAmount(int amount); // function prototype

int main()

{
int amount = 0;
cout << "How many bottles of beer on the wall? ";
cin >> amount;

bottleAmount(amount);
return 0; 

}

       bool bottleAmount(int amount)
{
bool status;

if (amount >= 2)
    status = true;
{
    for (amount; amount > 0 && amount < 101; amount -= 1)
    {
        cout << amount << " bottles of beer on the wall\n"
            << amount << " bottles of beer\n"
            << "Take 1 down, pass it around\n"
            << amount - 1 << " bottles of beer on the wall\n\n";
}
        if (amount < 2)
        status =  false;
{
        cout << "invalid value";
}
}

Answer 1

使用 void 函数（不返回值的函数）当然可以做得更好。您可能想改变这样一个事实，即不知何故 amount 变成 bottles 并且计算机应该知道这一点，而无需将值复制到 bottles。

#include <iostream>

using namespace std;

void bottleAmount(int amount); // function prototype

    int main()
        
        {
               int amount = 0; // initialize to zero
               cout << "How many bottles of beer on the wall? ";
               cin >> amount;
        
               bottleAmount(amount);
               return 0; // generally it is a good idea to properly end a program
           
        }
    
    void bottleAmount(int amount)
    {
     if (amount >= 2) 
            {
                cout << amount << " bottle(s) of beer on the wall\n"
                    << amount << " bottle(s) of beer\n"
                    << "Take 1 down, pass it around\n"
                    << amount - 1 << " bottle(s) of beer on the wall\n\n";
            }
     else 
            {
                cout << amount << " bottle of beer on the wall\n"
                    << amount << " bottle of beer\n"
                    << "Take 1 down, pass it around\n"
                    << "No more bottles of beer on the wall\n";
            }
    }