我想设计一个模块化程序来分析一年的降雨量数据，除了main函数之外，这个程序还应该有一个getData函数，用于从用户那里接收12个月的总降雨量，并将其存储在一个double类型的二维数组中，它还应该有四个值返回函数，用于计算totalRainfall、averageRainfall、driestMonth和wettestMonth。这最后两个函数返回具有最低和最高降雨量的月份数，而不是那几个月的降雨量。注意这个月的数字可以用来获得那几个月的降雨量。此信息应由main或由main调用的displayReport函数使用，以打印类似于以下内容的汇总降雨量报告：
这是我写的代码，我继续得到0返回，我不知道我做错了什么。

const int months = 12;
const int rain = 1;

void getData(double[months][rain], int, int);
double totalRainfall(double[months][rain], int, int);
double averageRain(double, int);
double driestMonth(double[months][rain], int, int);

int main()
{   
    double totalRain;
    double averageRainfall;
    int leastMonth;
    double rainfall[months][rain];
    
    getData(rainfall, months, rain);
    totalRain = totalRainfall(rainfall, months, rain);
    averageRainfall = averageRain(totalRain, months);
    leastMonth = driestMonth(rainfall, months, rain);
    
    cout << averageRainfall << endl;
    cout << leastMonth;
}

void getData(double rainfall[months][rain], int months, int rain)
{   
    double rainAmount;
    
    for(int row = 0; row < months; row++)
    {   
        for(int column = 0; column < rain; column++)
        {
            cout << "enter rain for month " << (row+1) << "--->";
            cin >> rainAmount;

            while(rainAmount <= 0)
            {
                cout << "rainfall must be greater then 0" << endl;
                cout << "enter rainfall ---> ";
                cin >> rainAmount;
            }

            rainfall[row][column] = rainAmount;
        }
    }
}

double totalRainfall(double rainfall[months][rain], int months, int rain)
{   
    double totalRain = 0;

    for (int column = 0; column < months; column++)
    {
        for(int row = 0; row < rain; row++)
        {
            totalRain += rainfall[column][row];
        }
    }
    return totalRain;
}

double averageRain(double totalRain, int months)
{   
    double averageRainfall;
    averageRainfall = totalRain / months;
    return averageRainfall;
}

double driestMonth(double rainfall[months][rain], int months, int rain)
{
    double leastRainMonth = rainfall[0][0];
    int leastMonth;
    
    for(int row = 0; row < months; row++)
    {
        for(int column = 0; column < rain; rain++)
        {
            if(rainfall[row][column] < leastMonth)
            {
                leastRainMonth = rainfall[row][column];
                leastMonth = row;
            }   
        }   
    }
    
    return leastMonth;
}