#include<stdio.h>
#include<conio.h>
int main()
{
    char *str,case_ch;
    int lv=0;
    str=(char *)malloc(11*sizeof(char));
    printf("enter the date in this format dd/mm/yyyy");
    scanf("%s",str);
    for(lv=0;str[lv];lv++)
    {
        if(str[lv]=='0')
        {
            switch(str[lv+1])
            {
                case '1':
                    printf("first");
                    break;
                case '2':
                    printf("second ");
                    break;
                case '3':
                    printf("third ");
                    break;
                case '4':
                    printf("fourth ");
                    break;
                case '5':
                    printf("fifth ");
                    break;
                case '6':
                    printf("sixth ");
                    break;
                case '7':
                    printf("seventh ");
                    break;
                case '8':
                    printf("eigth ");
                    break;
                case '9':
                    printf("nineth ");
                    break;
                default:
                    printf("input wrong");
                    break;
            }
            break;
        }
        else if(str[lv]=='1')
        {
            switch(str[lv+1])
            {
                case '0':
                    printf("tength ");
                    break;
                case '1':
                    printf("eleventh ");
                    break;
                case '2':
                    printf("twelevth ");
                    break;
                case '3':
                    printf("thiteenth ");
                    break;
                case '4':
                    printf("fourteenth ");
                    break;
                case '5':
                    printf("fifteenth ");
                    break;
                case '6':
                    printf("sixteenth ");
                    break;
                case '7':
                    printf("seventeenth ");
                    break;
                case '8':
                    printf("eigteenth ");
                    break;
                case '9':
                    printf("nineteenth ");
                    break;
                default:
                    printf("input wrong");
                    break;
            }
            break;
        }
        else if(str[lv]=='2')
        {
            switch(str[lv+1])
            {
                case '0':
                    printf("twenteeth ");
                    break;
                case '1':
                    printf("twenty first");
                    break;
                case '2':
                    printf("twenty second ");
                    break;
                case '3':
                    printf("twenty thrid ");
                    break;
                case '4':
                    printf("twenty fourth ");
                    break;
                case '5':
                    printf("twenty fifth ");
                    break;
                case '6':
                    printf("twenty sixth ");
                    break;
                case '7':
                    printf("twenty seventh ");
                    break;
                case '8':
                    printf("twenty eighth");
                    break;
                case '9':
                    printf("twety ningth");
                    break;
                default:
                    printf("input wrong");
                    break;
            }
            break;
        }
        else if(str[lv]=='3')
        {
            switch(str[lv+1])
            {
                case '0':
                    printf("thrity ");
                    break;
                case '1':
                    printf("thirty first");
                    break;
                default:
                    printf("invalid input");
                    break;
            }
            break;
        }
        else
        {
            printf("invalid input");
            break;
        }
    }
    for(lv=3;str[lv];lv++)
    {
        if(str[lv]=='0')
        {
            switch(str[lv+1])
            {
                case '1':
                    printf("jan");
                    break;
                case '2':
                    printf("Feb");
                    break;
                case '3':
                    printf("March ");
                    break;
                case '4':
                    printf("April");
                    break;
                case '5':
                    printf("May ");
                    break;
                case '6':
                    printf("june ");
                    break;
                case '7':
                    printf("july ");
                    break;
                case '8':
                    printf("august");
                    break;
                case '9':
                    printf("september ");
                    break;
                default:
                    printf("input wrong");
                    break;
            }
            break;
        }
        else if(str[lv]=='1')
        {
            switch(str[lv+1])
            {
                case '0':
                    printf("october");
                    break;
                case '1':
                    printf("november");
                    break;
                case '2':
                    printf("december");
                    break;
                default:
                    printf("invalid input");
                    break;
            }
            break;
        }
        else
        {
            printf("invalid input");
            break;
        }

    }
    /*how to write code for year if i write in the above manner the code will be tooo lenghty*/
}

void printOrdinalNumber(int n)
{
    if(n < 20)
    {
        switch(n)
        {
           ...
        }
    }
    else
    {
        int tens = n / 10;
        int ones = n % 10;

        switch(tens)
        { ... }

        if(ones >= 1)
             printOrdinalNumber(ones);
    }
}