Doing a Printing out Integers in String Format . Like 55 to Fifty five

[datainjector]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
 * 
 */
int main(void ) {
    
    char stringEnteredVar[8]; 
    char stringUnitsVar[][10] = { "Zero","One", "Two", "three", "four", "five", "six", "seven", "Eight", "nine" };
    char stringTensVar[][10] = { "Tens","eleven", "twell", "thirteen", "fourteen", "fiofteen", "sixteen", "seventeen", "eiughtteen", "ninteen" };
    char stringAbove20[][10]= { "TWenty", "Thirty", "forty", "fifty", "sixty", "sevety", "eighty", "ninghty" };
    char stringHundred[] = {"Hundred"};
    char stringThousand[] = {"Thousand"};
    
    
    printf( "Enter a Number that is less than 1000:" );
    scanf ( "%s", stringEnteredVar );

    
    printf ( "%d , %d\n", strlen(stringEnteredVar) , atoi( stringEnteredVar) ); 
    
     if ( strlen(stringEnteredVar) == 1 && atoi( stringEnteredVar) <= 9 )
    {
        printf ( "UNITS:%s\n" , stringUnitsVar[atoi(stringEnteredVar)]);
	printf ( "Unit\n" );
    }  
 
    else if ( strlen(stringEnteredVar) == 2 &&  atoi( stringEnteredVar ) <= 19)
    {

        
   	printf ( "TENS:%s\n" , stringTensVar[atoi(stringEnteredVar)-10]);
    }
    else if ( strlen(stringEnteredVar) == 2 && (atoi( stringEnteredVar ) >= 20 && atoi( stringEnteredVar) <= 99) )
    {


   
      char charFirst, charSecound ;
      charFirst = charSecound = '\0';
      
      charFirst = stringEnteredVar[0];
      charSecound = stringEnteredVar[1];

      printf ( "\n%d  %d\n",atoi(&charFirst) , atoi(&charSecound) );
      printf ( "%s", stringAbove20[atoi(&charFirst)-2],  );
      printf ( "%s", stringUnitsVar[atoi(&charSecound)] ) ;

     
    
      
    }
     
    else if ( strlen( stringEnteredVar ) == 3 && atoi( stringEnteredVar) >=100 && atoi ( stringEnteredVar) <= 999 ) 
    {
      char charFirst, charSecound , charThird ; 

      charFirst = stringEnteredVar[0];
      charSecound = stringEnteredVar[1];
      charThird = stringEnteredVar[2];
      // printf ( "%s%s and %s%s\n", stringUnitsVar[] 

      printf ( "hundreds : %c , %c , %c \n", charFirst, charSecound , charThird );
       
    }
        
    
     return (0);
}

[datainjector]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
 * 
 */
int main(void ) {
    
    char stringEnteredVar[8]; 
    char stringUnitsVar[][10] = { "Zero","One", "Two", "three", "four", "five", "six", "seven", "Eight", "nine" };
    char stringTensVar[][10] = { "Tens","eleven", "twell", "thirteen", "fourteen", "fiofteen", "sixteen", "seventeen", "eiughtteen", "ninteen" };
    char stringAbove20[][10]= { "TWenty", "Thirty", "forty", "fifty", "sixty", "sevety", "eighty", "ninghty" };
    char stringHundred[] = {"Hundred"};
    char stringThousand[] = {"Thousand"};
    
    
    printf( "Enter a Number that is less than 1000:" );
    scanf ( "%s", stringEnteredVar );

    
    printf ( "%d , %d\n", strlen(stringEnteredVar) , atoi( stringEnteredVar) ); 
    
     if ( strlen(stringEnteredVar) == 1 && atoi( stringEnteredVar) <= 9 )
    {
        printf ( "UNITS:%s\n" , stringUnitsVar[atoi(stringEnteredVar)]);
    printf ( "Unit\n" );
    }  
 
    else if ( strlen(stringEnteredVar) == 2 &&  atoi( stringEnteredVar ) <= 19)
    {

        
       printf ( "TENS:%s\n" , stringTensVar[atoi(stringEnteredVar)-10]);
    }
    else if ( strlen(stringEnteredVar) == 2 && (atoi( stringEnteredVar ) >= 20 && atoi( stringEnteredVar) <= 99) )
    {


   
      char charFirst, charSecound ;
      charFirst = charSecound = '\0';
      
      charFirst = stringEnteredVar[0];
      charSecound = stringEnteredVar[1];

      printf ( "\n%d  %d\n",atoi(&charFirst) , atoi(&charSecound) );
      printf ( "%s", stringAbove20[atoi(&charFirst)-2]  );
      printf ( "%s", stringUnitsVar[atoi(&charSecound)]) ;

     
    
      
    }
     
    else if ( strlen( stringEnteredVar ) == 3 && atoi( stringEnteredVar) >=100 && atoi ( stringEnteredVar) <= 999 ) 
    {
      char charFirst, charSecound , charThird ; 

      charFirst = stringEnteredVar[0];
      charSecound = stringEnteredVar[1];
      charThird = stringEnteredVar[2];
      // printf ( "%s%s and %s%s\n", stringUnitsVar[] 

      printf ( "hundreds : %c , %c , %c \n", charFirst, charSecound , charThird );
       
    }
        
    
     return (0);
}

The Third Else if is sappose to print out the 2 Strings ..
For example if I put in 55 .. it should print out fifty Five .
Thou this dosnt seem to hapen i have looked around the ocde and havmnt spotted a problem .

This isnt a University question . i got this question from the C beginners to Novice book by APRESS .

Thanks
Karan

[matsp]

Perhaps some consistency would be good:

    char stringUnitsVar[][10] = { "Zero","One", "Two", "three", "four", "five", "six", "seven", "Eight", "nine" };
// Mixing upper and lower case - use lower case only
    char stringTensVar[][10] = { "Tens","eleven", "twell", "thirteen", "fourteen", "fiofteen", "sixteen", "seventeen", "eiughtteen", "ninteen" };
// Several typos in red (green letters should be removed), and use lower case only 
    char stringAbove20[][10]= { "TWenty", "Thirty", "forty", "fifty", "sixty", "sevety", "eighty", "ninghty" };
// As above
    char stringHundred[] = {"Hundred"};
    char stringThousand[] = {"Thousand"};

      char charFirst, charSecound ;
      charFirst = charSecound = '\0';
      
      charFirst = stringEnteredVar[0];
      charSecound = stringEnteredVar[1];

      printf ( "\n%d  %d\n",atoi(&charFirst) , atoi(&charSecound) );
      printf ( "%s", stringAbove20[atoi(&charFirst)-2]  );
      printf ( "%s", stringUnitsVar[atoi(&charSecound)]) ;

You shouldn't use atoi() on a single char - it's by far not guaranteed to be followed by a zero [to mark the end of the string], so you get some undefined value back from atoi, and that will give you undefined behaviour in general - it may work sometimes, but most of the time it won't.

Just subtract '0' from the respective digit.

[Further, I would suggest you only do ONE atoi() at the very beginning of your code, and then use this value combined with divide and modulo].

--
Mats