hmmm... ok... thanks !!

oh!! then does this problem arise because of the problem in allocating the required amount of memory by the compiler ?

thanks for your response. but can u please tell me why executable statements cant be given before variable declaration ?

i couldn't find the answer. can u please help me if you know the answer.

clrscr() is usually given after the declaration of all variables. If it is given before the declaration(of variables), the compiler points out an error. Why is this due to ? Will there be any problem...

what do you mean in the last line ? can u please explain ?

getch() returns the character you typed without displaying it on the screen.
getche() returns the character you typed by displaying(echoing) it on the screen.
and finally, getchar() works similarly...

can anyone please tell me the function of calloc() and malloc() and the difference between them ...

what does (char*)malloc(n) mean ??