Aha, ok i understand now...thx

What...?You're obviously an idiot because you can't make a difference between not knowing some function and not knowing where to find explanation how that function works and what it is used for...As...

You're right..I wasn't familiar with sscanf function...I learnt something new today..:) although I don't understand why did you use IF condition ...?

well i would do something like this:

...// i skipped the beginning of the code: char a etc...

if (a==C){/* a is variable user enters via keyboard(next to which are info you want to extract)*/
...

Yes, you don't need to write a prototype before function in which it is called (usually in main) but it's common to do like this:
-function prototypes
-main
-function definition...
that is...

you can't use *k=10, because pointer points to place in memory...10 doesn't have place in memory its just a number.you need to have variable on which pointer is going to point (which has place in...

I which language...?I can pots you one solution in c if you want....