Converting numbers to spellings (eg, 10 to ten)

[SONIAVANSHI]

How to convert numerals like 123 into spellings like one hundred twenty three?

[debasisdas]

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Debasis

[MarshMallow]

It is exactly the same assignement my Professor gave me 2 months ago during the course("ANSI C Programming");for example we were assigned a 9 digits number( e.g. 987123456) and we had to cast it into "nine hundred eightyseven MILLION one hundred tewnty three thousand four hundred fifty six".
I have to say that it took me the whole day to design a proper algorithm.
I really would like you to focus on one fact:look how patterns repeat;you basically have to design an algorithm to translate just a 3 digit group,and apply it iteratively to the entire input,following the tipical Divide et Impera paradygm.
Take a look at some useful functions in the <string.h> ANSI C header;strcat should be the one wich suits most this kind of problem.

[sksriharsha]

Hi,
I am just adding to what MarshMallow has written.

1. Accept the number as a string.
2. Find its length
3. Send the nos in threes to a function "numword()" which prints words for numbers from zero to 999.
4.Depending on the length print "thousands" or "millons" or "billions" or ....

5. Function numword() should accept the three digits as a 3 element string.
6. Take the first element. Use it as index in a Case/switch statement to print words for nos from 1 to 9.Then print "hundred".
6. If second element is 1 use another case/switch statement with third element as index to print from eleven to nineteen.
7. If second element is not 1, take the third element (units) and use it in the previous switch-case statement to print words for numbers from 1 to 9.
8. Take the second element and use it in another switch/case statement to print words for twenty to ninety.
9. Use your own logic to tackle zeroes in both numword() and in the main program.

It will be interesting to extend the program for decimals also.