用C语言Write a program that asks the user for a two-digit number, then prints the English word for the number:

Sure, here's the code:

#include <stdio.h>

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

    int tens = num / 10;
    int ones = num % 10;

    switch (tens) {
        case 1:
            switch (ones) {
                case 0:
                    printf("ten");
                    break;
                case 1:
                    printf("eleven");
                    break;
                case 2:
                    printf("twelve");
                    break;
                case 3:
                    printf("thirteen");
                    break;
                case 4:
                    printf("fourteen");
                    break;
                case 5:
                    printf("fifteen");
                    break;
                case 6:
                    printf("sixteen");
                    break;
                case 7:
                    printf("seventeen");
                    break;
                case 8:
                    printf("eighteen");
                    break;
                case 9:
                    printf("nineteen");
                    break;
            }
            break;
        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;
    }

    if (tens != 1) {
        switch (ones) {
            case 1:
                printf("one");
                break;
            case 2:
                printf("two");
                break;
            case 3:
                printf("three");
                break;
            case 4:
                printf("four");
                break;
            case 5:
                printf("five");
                break;
            case 6:
                printf("six");
                break;
            case 7:
                printf("seven");
                break;
            case 8:
                printf("eight");
                break;
            case 9:
                printf("nine");
                break;
        }
    }

    printf("\n");

    return 0;
}

This program asks the user for a two-digit number and then prints the English word for the number. For example, if the user enters 42, the program will output "forty-two".