Number to words

#include<stdio.h>
#include<string.h>
int main()
{
char ch[4];int i;
printf("Enter the number\n");
scanf("%s",ch);

        for(i=0;i<strlen(ch);++i)
        {
            switch(strlen(ch)-i)
            {
            case 1:
                switch(ch[i])
                {
                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;
            case 2:
                switch(ch[i])
                {
                case '1':
                    i=i+1;
                            switch(ch[i])
                            {
                             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;
                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;
            default:
                printf("One Hundred");
                i=i+2;
            }
        }

return 0;
}