C Program to print the two digit number in words

/***********************************************
 Program to print the two digit number in words
 ***********************************************/

#include <stdio.h>  // include stdio.h library

int main(void)
{
    int num1, num2;

    printf("Enter a two-digit number: ");
    scanf("%1d%1d", &num1, &num2);

    printf("You have entered: ");

    // print word for the first digit
    switch (num1)
    {
        case 1:
            // special case for numbers between 11-19
            switch (num2)
            {
                case 0:
                    printf("ten"); 
                    return 0;
                case 1:
                    printf("eleven"); 
                    return 0;
                case 2:
                    printf("twelve"); 
                    return 0;
                case 3:
                    printf("thirteen"); 
                    return 0;
                case 4:
                    printf("fourteen"); 
                    return 0;
                case 5:
                    printf("fifteen"); 
                    return 0;
                case 6:
                    printf("sixteen"); 
                    return 0;
                case 7:
                    printf("seventeen"); 
                    return 0;
                case 8:
                    printf("eigthteen"); 
                    return 0;
                case 9:
                    printf("nineteen"); 
                    return 0;
            }
        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;
    }

    // print word for the second digit
    switch (num2)
    {
        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;
    }

    return 0;
}