displaying the language of the program in an input file

Homework ?

You would need to have your program recognise the syntax and grammar of all the languages you would want to recognize.

looks like a difficult question.

if the input programs are guaranteed to be correct (in the language they are wriiten in, at least syntaticall, grammatically correct) then you can just call for every input file a compiler of that language.
if the compiler returns an error you switch to the next compiler, until you either get a positive response, or you run out of compilers.

I can sketch you a pseudo-code if you want.

please tell me more which tools are available to you and which languages you want to recognise.

How many languages do you need to check for?

If the input is a file containing a program in c language,
then this program in c will output the language of the program in the input file:

#include <stdio.h>
int main(void){
    puts("c language");
}

ozo, I think U didn't read the question properly. This should be the right one:

#include <stdio.h>
int main(void)
{
   puts("THE LANGUAGE OF THE PROGRAM IN THE INPUT FILE.");
}

you didn't actually say anything new to what I've already mentioned before...  mrbrocoli.

Pretty rude of you to post it as an answer!

shlomoy: read the 2nd part of the answer

I did.
so?

read again

read it again, so?

to mrbrocoli,

could u please give me a clue on how to go about it.

thankx

Something like this:

sprintf(cmdline, "compiler_name_and_flags %s", input_file);
res = system(cmdline);
if (res == EXIT_SUCCESS) {
    puts("input file is a valid C program");
} else {
   puts("dont know whats in the input file");
}

thankx

to mrbrocoli ,
can u pls give me an example of an input file. i am a little confused.

i am a little confused . can u pls tell me what will be in the input file