编写一个程序，要求用户输入一个两位数，然后输出显示该数的英文单词。提示：把数分解为两个数字。用一个switch语句显示第一位数字对应的单词（“twenty”、“thirty”等），用第二个switch语句显示第二位数字对应的单词。不要忘记11~19需要特殊处理。用c语言

实现如下：

#include <stdio.h>

int main() {
    int num, first, second;
    const char *digits[] = {"zero", "one", "two", "three", "four", "five", 
                            "six", "seven", "eight", "nine", "ten", "eleven", 
                            "twelve", "thirteen", "fourteen", "fifteen", "sixteen", 
                            "seventeen", "eighteen", "nineteen"};
    const char *tens[] = {"", "", "twenty", "thirty", "forty", "fifty", 
                          "sixty", "seventy", "eighty", "ninety"};

    printf("Please input a two-digit number:\n");
    scanf("%d", &num);

    if (num < 10 || num > 99) { // 判断输入是否为两位数
        printf("Invalid input!\n");
        return 1;
    }

    first = num / 10; // 获取十位数字
    second = num % 10; // 获取个位数字

    printf("The English word for %d is: ", num);

    switch (first) {
        case 1:
            printf("%s\n", digits[num]);
            return 0;
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
            printf("%s ", tens[first]);
            break;
    }

    switch (second) {
        case 0:
            if (first == 0) {
                printf("%s\n", digits[second]);
            }
            break;
        case 1:
            printf("%s\n", digits[10 + second]);
            break;
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
            printf("%s\n", digits[second]);
            break;
    }

    return 0;
}

样例输入：

55

样例输出：

The English word for 55 is: fifty five