将数字转化为中文大写形式 C++

问题遇到的现象和发生背景
问题相关代码,请勿粘贴截图

#include
#include
#include
using namespace std;
double round(double r);
void printf(int);
string word[10] = { "零","壹","贰","叁","肆","伍","陆","柒","捌","玖" };
int main()
{

double money;
cout << "please enter the number,the  number is retained annd rounded to "
    << "tow decimal places : ";// retain(保留),round(把...四舍五入),decimal(n.小数)
cin >> money;
cout << endl;
double dmoney = round(money);
long long imoney = dmoney;
long long temp = imoney;
long long i = imoney;
int n = 0;
do
{
    i = i / 10;
    n++;
} while (i != 0);

while (n >= 9)
{
    long long a = imoney / int(pow(10, 8));
    cout << a << endl;
    printf(a);
    cout << "亿";
    imoney = imoney - a * int(pow(10, 8));
    n = 8;
}

while (n >= 5)
{
    int a = imoney / int(pow(10, 4));
    printf(a);
    cout << "万";
    imoney = imoney - a * int(pow(10, 4));
    n = 4;
}

printf(imoney);
cout << "元";
if (dmoney - temp != 0)
{

    int aa = (dmoney - imoney) * 100;
    int rr = aa / 10;
    if (rr != 0)
        cout << word[rr] << "角";
    rr = aa - rr * 10;
    if (rr != 0)
        cout << word[rr] << "分";
}
return 0;

}
double round(double r)
{
int temp = r * 100 + 0.5;
return double(temp) / 100;
}
void printf(int a)
{
int i = a;
int k = 0;
do
{
i = i / 10;
k++;
} while (i != 0);

while (k >= 1)
{

    int gg = a / int(pow(10, k - 1)) - a / int(pow(10, k)) * 10;//Very important

    if (gg != 0)
    {

        cout << word[gg];
        switch (k)
        {
        case 4:
            cout << "仟";
            break;
        case 3:
            cout << "佰";
            break;
        case 2:
            cout << "拾";
            break;
        }


    }
    if (gg == 0)
        cout << word[0];
    k--;
}

}

数字大,就会出现乱码,为什么呢?
我的解答思路和尝试过的方法
我想要达到的结果

数字大,就会出现乱码?多大的数字会出现乱码呢?是不是20,21行重复了呢?
贴出相关错误信息能帮助更快找到问题所在