用C编写一个程序，要求用户输入一个两位数然后显示该数的英文单词，用switch语句

Sure, here's the code:

#include <stdio.h>

int main() {
    int num;
    printf("Please enter a two-digit number: ");
    scanf("%d", &num);

    switch(num) {
        case 10:
            printf("Ten\n");
            break;
        case 11:
            printf("Eleven\n");
            break;
        case 12:
            printf("Twelve\n");
            break;
        case 13:
            printf("Thirteen\n");
            break;
        case 14:
            printf("Fourteen\n");
            break;
        case 15:
            printf("Fifteen\n");
            break;
        case 16:
            printf("Sixteen\n");
            break;
        case 17:
            printf("Seventeen\n");
            break;
        case 18:
            printf("Eighteen\n");
            break;
        case 19:
            printf("Nineteen\n");
            break;
        default:
            switch(num / 10) {
                case 2:
                    printf("Twenty ");
                    break;
                case 3:
                    printf("Thirty ");
                    break;
                case 4:
                    printf("Forty ");
                    break;
                case 5:
                    printf("Fifty ");
                    break;
                case 6:
                    printf("Sixty ");
                    break;
                case 7:
                    printf("Seventy ");
                    break;
                case 8:
                    printf("Eighty ");
                    break;
                case 9:
                    printf("Ninety ");
                    break;
            }

            switch(num % 10) {
                case 1:
                    printf("One\n");
                    break;
                case 2:
                    printf("Two\n");
                    break;
                case 3:
                    printf("Three\n");
                    break;
                case 4:
                    printf("Four\n");
                    break;
                case 5:
                    printf("Five\n");
                    break;
                case 6:
                    printf("Six\n");
                    break;
                case 7:
                    printf("Seven\n");
                    break;
                case 8:
                    printf("Eight\n");
                    break;
                case 9:
                    printf("Nine\n");
                    break;
            }
    }

    return 0;
}

Hope this helps!