数字转汉字

全局常量的声明

const char * chnNumChar [10] = {"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"};
const char * sectionChar [4] = {"", "万", "亿", "万亿"};
const char * weightChar [4] = {"", "十", "百", "千"};

typedef long long ILONG;

转化四位及其四位以下的整数

string section2chn(ILONG onum)
{
    string  res("");
    int weightindex = 0;
    bool iszero = false;
    while (onum > 0)
    {
        if (onum % 10)
            res = string(chnNumChar[onum % 10]) + weightChar[weightindex] + (iszero?chnNumChar[0]:"") + res;
        else if (!res.empty())
            iszero = true;
        ++ weightindex;
        onum /= 10;
    }
    return res;
}

转化整数

string num2chn(ILONG onum)
{
    string  res("");
    int sectionindex = 0;
    bool isneedzero = false;
    while (onum > 0)
    {
        if (onum % 10000)
            res = section2chn(onum % 10000) + sectionChar[sectionindex] + (isneedzero?chnNumChar[0]:"") + res;
        else if (!res.empty())
            isneedzero = true;

        if (onum % 10000 < 1000)
            isneedzero = true;
        ++ sectionindex;
        onum /= 10000;
    }
    return res;
}

测试

#include <iostream>
#include <string>
#include <random>


int main()
{
    ILONG temnum = 6000000181;
    cout
        << temnum
        << "\t\t"
        << num2chn(temnum)
        << endl;
    
    random_device rd;
    for (int i = 0; i < 1000; ++ i)
    {
        ILONG temnum = rd() ;
        cout
            << temnum
            << "\t\t"
            << num2chn(temnum)
            << endl;
    }

    return 0;
}