c++,string,用户输入两个数字（0到20的实数）的英文单词，计算出两数字的乘积，并输出其英文单词

以下是一个示例代码：

#include <iostream>
#include <string>

using namespace std;

int main() {
    string num1, num2;
    string ones[] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
    string tens[] = {"", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};

    cout << "Enter the first number (between 0 and 20): ";
    cin >> num1;

    cout << "Enter the second number (between 0 and 20): ";
    cin >> num2;

    int n1 = 0, n2 = 0;

    for (int i = 0; i < 20; i++) {
        if (num1 == ones[i]) {
            n1 = i;
            break;
        }
    }

    for (int i = 2; i < 10; i++) {
        if (num1 == tens[i]) {
            n1 = i * 10;
            break;
        }
    }

    for (int i = 0; i < 20; i++) {
        if (num2 == ones[i]) {
            n2 = i;
            break;
        }
    }

    for (int i = 2; i < 10; i++) {
        if (num2 == tens[i]) {
            n2 = i * 10;
            break;
        }
    }

    int result = n1 * n2;
    string result_str;

    if (result < 20) {
        result_str = ones[result];
    } else {
        result_str = tens[result / 10];
        if (result % 10 != 0) {
            result_str += "-" + ones[result % 10];
        }
    }

    cout << "The product is: " << result_str << endl;

    return 0;
}

该代码将用户输入的两个数字转换为整数，计算它们的乘积，然后将结果转换为英文单词。在转换过程中，我们使用了两个字符串数组，一个用于处理个位数，一个用于处理十位数。