人民币大写转换工具C++

人民币大写转换规则

中文大写金额数字应用正楷或行书填写，如壹、贰、叁、肆、伍、陆、柒、捌、玖、拾、佰、仟、万、亿、元、角、分、零、整（正）等字样。不得用一、二（两）、三、四、五、六、七、八、九、十、廿、毛、另（或0）填写，不得自造简化字。如果金额数字书写中使用繁体字，如贰、陆、亿、万、圆的，也可。

中文大写金额数字到"元"为止的，在"元"之后，应写"整"（或"正"）字，在"角"之后，可以不写"整"（或"正"）字。大写金额数字有"分"的，“分"后面不写"整”（或"正"）字。

中文大写金额数字前应标明"人民币"字样，大写金额数字有"分"的，“分"后面不写"整”（或"正"）字。

中文大写金额数字前应标明"人民币"字样，大写金额数字应紧接"人民币"字样填写，不得留有空白。大写金额数字前未印"人民币"字样的，应加填"人民币"三字。在票据和结算凭证大写金额栏内不得预印固定的"仟、佰、拾、万、仟、佰、拾、元、角、分"字样。

人民币大写转换工具(支持任意位金额转换)

#include <iostream>
#include <string>
#include <sstream>
using namespace std;

/*
案例：
1234.09
0.00
0.09
1002.03
01002.4032
120000.34
12000000000000003400000056 
*/

//检查字符串合法性
bool judge_isnum(string input){
    bool is_num = true;
    if(input[0] = '-')
        input = input.erase(0, 1);
    for (int i = 0; i < input.length(); i++){
        if (input[i] == '.'){
            input = input.erase(i, 1);
            break;
        }
    }
    for (int i = 0; i < input.length(); i++){
        if (input[i] < '0' || input[i] > '9'){
            is_num = false;
            break;
        }
    }
    return is_num;
}

// 将数字转换为大写
string get_c(int c){
    switch(c){
    case 0: return "零";
    case 1: return "壹";
    case 2: return "贰";
    case 3: return "叁";
    case 4: return "肆";
    case 5: return "伍";
    case 6: return "陆";
    case 7: return "柒";
    case 8: return "捌";
    case 9: return "玖";
    default: return "";
    }
}

// 判断一个字符串是否全0
bool judge_zero(string num){
    bool zero = true;
    for (int i = 0; i < num.length(); i++){
        if (num[i] != '0'){
            zero = false;
            break;
        }
    }
    return zero;
}

// 字符串转换为数字
int str_to_num(string str){
    int num ;
    stringstream ss;  
    ss << str;                  
    ss >> num;
    return num;
}

// 数字转换为字符串
string num_to_str(int num){
    string str;
    stringstream ss;
    ss << num;
    ss >> str;
    return str;
}

// 分离出小数点前面部分
string get_pre(string input){
    string pre = "";
    int i = 0;
    while (i < input.length() && input[i] != '.'){
        pre += input[i];
        i++;
    }
    return pre;
}

// 分离出小数点后面部分
string get_post(string input){
    int i = 0;
    string post = "";
    while (i < input.length() && input[i] != '.'){
        i++;
    }
    if (i < input.length()){
        i++;
        while (i < input.length()){
            post += input[i];
            i++;
        }
    }
    return post;
}

// 四位及以下数字转换为大写
string get_four(int num){
    string out = "";
    if (num == 0)
        out = "";
    else if (num < 10){
        out = get_c(num);
    }
    else if(num < 100){
        if (num % 10 == 0)
            out = get_four(num / 10) + "拾";
        else 
            out = get_four(num / 10) + "拾" + get_four(num % 10);
    }
    else if(num < 1000){
        if (num % 100 == 0)
            out = get_four(num / 100) + "佰";
        else if(num % 100 < 10)
            out = get_four(num / 100) + "佰零" + get_four(num % 100);
        else
            out = get_four(num / 100) + "佰" + get_four(num % 100);
            
    }
    else if(num < 10000){
        if (num % 1000 == 0)
            out = get_four(num / 1000) + "仟";
        else if(num % 1000 < 100)
            out = get_four(num / 1000) + "仟零" + get_four(num % 1000);
        else
            out = get_four(num / 1000) + "仟" + get_four(num % 1000);
    }
    return out;
}

//八位数及以下数字转换为大写
string get_eight(string num){
    while (num[0] == '0') // 删除开头的0
        num = num.erase(0, 1);
    if (num.length() <= 4)
        return get_four(str_to_num(num));
    string out;
    string str1 = num.substr(0, num.length() - 4);
    string str2 = num.erase(0, num.length() - 4);
    int num1 = str_to_num(str1);
    int num2 = str_to_num(str2);
    if (str2[0] == '0' && !judge_zero(str2))
        out = get_four(num1) + "万零" + get_four(num2);
    else if (judge_zero(str2))
        out = get_four(num1) + "万";
    else
        out = get_four(num1) + "万" + get_four(num2);
    return out;
}

// 十六位数及以下数字转换为大写
string get_16(string num){
    while (num[0] == '0') // 删除开头的0
        num = num.erase(0, 1);
    if (num.length() <= 8)
        return get_eight(num);
    string out;
    string str1 = num.substr(0, num.length() - 8);
    string str2 = num.erase(0, num.length() - 8);
    if (str2[0] == '0' && !judge_zero(str2))
        out = get_eight(str1) + "亿零" + get_eight(str2);
    else if (judge_zero(str2))
        out = get_eight(str1) + "亿";
    else 
        out = get_eight(str1) + "亿" + get_eight(str2);
    return out;
}

// 十六位数以上数字转换为大写,递归调用
string get_out_16(string num){
    while (num[0] == '0') // 删除开头的0
        num = num.erase(0, 1);
    if (num.length() <= 16)
        return get_16(num);
    string out;
    while (num.length() > 16){
        string str1 = num.substr(0, num.length() - 8);
        string str2 = num.erase(0, num.length() - 8);
        if (str2[0] == '0' && !judge_zero(str2))
            out = get_out_16(str1) + "亿零" + get_eight(str2);
        else if (judge_zero(str2))
            out = get_out_16(str1) + "亿";
        else 
            out = get_out_16(str1) + "亿" + get_eight(str2);
    }
    return out;
}


// 整数部分转换为大写
string get_pre_c(string pre){
    string out1 = "";
    if (pre.length() <= 4){
        int num = str_to_num(pre);
        out1 = get_four(num);
    }
    else if (pre.length() <= 8)
        out1 = get_eight(pre);
    else if (pre.length() <= 16)
        out1 = get_16(pre);
    else
        out1 = get_out_16(pre);
    return out1;
}


// 小数部分转换为大写
string get_post_c(string post, int len){
    string out2;
    int num;
    if (post.length() == 0)
        out2 = "";
    else if (post.length() == 1){
        num = str_to_num(post);
        if (num == 0)
            out2 = "";
        else
            out2 = post + "角";
    }
    else{ // 字符串长度>=2，只取前两个
        string two = post.substr(0, 2);
        num = str_to_num(two);

        if (num == 0){
            out2 = "";
        }
        else if (num < 10 && len != 0)
            out2 = "零" + get_c(num) + "分";
        else if (num < 10 && len == 0) // 整数部分为0，分前面不需要0
            out2 = get_c(num) + "分";
        else{
            int jiao = num / 10;
            int fen = num % 10;
            if (fen == 0)
                out2 = get_c(jiao) + "角";
            else
                out2 = get_c(jiao) + "角" + get_c(fen) + "分";
        }
    }
    return out2;
}


int main(){
    string input;
    cout << "请输入需要转换的金额(输入负数退出)： ";
    cin >> input;
    while(!judge_isnum(input)){
        cout << "不合法，请重新输入： ";
        cin >> input;
    }

    while (input[0] != '-'){
        while (input[0] == '0') // 删除开头的0
            input = input.erase(0, 1);
        string pre = get_pre(input);
        string post = get_post(input);
        
        string out1 = get_pre_c(pre);
        string out2 = get_post_c(post, pre.length());

        string output = "";
        if (out1.length() == 0 && out2.length() == 0)
            output = "人民币零元整";
        else if(out1.length() == 0)
            output = "人民币" + out2;
        else if(out2.length() == 0)
            output = "人民币" + out1 + "元整";
        else
            output = "人民币" + out1 + "元" + out2;
        cout << "转换后大写为： " << output << endl;
        
        cout << endl;
        cout << "请输入需要转换的金额(输入负数退出)： ";
        cin >> input;
        while(!judge_isnum(input)){
            cout << "不合法，请重新输入： ";
            cin >> input;
        }
    }
    return 0;
}

来源：CSDN

作者：happyyouli

链接：https://blog.csdn.net/happyyouli/article/details/104620328