C++以字符串形式打印出来的整数数字

所以我正在处理的代码(用于学校(假设将用户给定的整数打印成字符串(示例输入：154 | 输出：一五四(。

目前我几乎已经弄清楚了，除了它是倒退的！需要弄清楚如何以正确的方式打印它(我的会打印出四五一(。

#include <iostream>
#include <string>
using namespace std;
void toString(int x) {
while (x > 0)
{
    int digit = x % 10;
    x /= 10;
    switch (digit) {
    case 1:
        cout << "One ";
        break;
    case 2:
        cout << "Two ";
        break;
    case 3:
        cout << "Three ";
        break;
    case 4:
        cout << "Four ";
        break;
    case 5:
        cout << "Five ";
        break;
    case 6:
        cout << "Six ";
        break;
    case 7:
        cout << "Seven ";
        break;
    case 8:
        cout << "Eight ";
        break;
    case 9:
        cout << "Nine ";
        break;
    case 0:
        cout << "Zero ";
        break;
    }
}   
}
int main()
{
int num;
cout << "Please enter a positive number" << endl;
cin >> num;
while (num > 0)
{
    toString(num);
    cout << "nPlease enter a positive number" << endl;
    cin >> num;
} 
cout << "You entered a number less than or equal to zero"
    << endl << "the program was terminated" << endl;
system("pause");
return 0;
}