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May 27th, 2009

clrscr is usually given after declaration of variables. why ?

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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 in allocating the required amount of memory if at all clrscr() is given before the declaration?

Kindly reply to this question !!

Thanks !!

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rocky2008

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May 27th, 2009

Re: clrscr is usually given after declaration of variables. why ?

Read "C Program Structure" section from your text book. I am sure, you will get the answer.

adatapost

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May 27th, 2009

Re: clrscr is usually given after declaration of variables. why ?

you can't put executable statements before variable declarations in C language.

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May 27th, 2009

Re: clrscr is usually given after declaration of variables. why ?

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

Click to Expand / Collapse Quote originally posted by adatapost ...

Read "C Program Structure" section from your text book. I am sure, you will get the answer.

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May 27th, 2009

Re: clrscr is usually given after declaration of variables. why ?

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

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

you can't put executable statements before variable declarations in C language.

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Re: clrscr is usually given after declaration of variables. why ?

If the answer is not in your text book then you need a different book! But I'm sure its in the book, you just need to study the sections about C language program structure.

C Syntax (Toggle Plain Text)
// includes go here
#include <stdio.h>
...
int main(int argc, char* argv[])
{
    // all variable declarations go here
    //
    // executable statements follow
    //
    {
         // new block, so more variables here
         // followed by executable statements
    } // end of block
} // end of main() function
// includes go here
#include <stdio.h>
...
int main(int argc, char* argv[])
{
    // all variable declarations go here
    //
    // executable statements follow
    //
    {
         // new block, so more variables here
         // followed by executable statements
    } // end of block
} // end of main() function

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Re: clrscr is usually given after declaration of variables. why ?

Click to Expand / Collapse Quote originally posted by rocky2008 ...

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

Yes -- because the iso standards say so. I have read that this requirement is going to be relaxed in the next revision of the standards, but no compilers have implemented that yet (for obvious reasons)

Last edited by Ancient Dragon; May 27th, 2009 at 8:30 am.

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Re: clrscr is usually given after declaration of variables. why ?

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

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

Yes -- because the iso standards say so. I have read that this requirement is going to be relaxed in the next revision of the standards, but no compilers have implemented that yet (for obvious reasons)

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Re: clrscr is usually given after declaration of variables. why ?

Click to Expand / Collapse Quote originally posted by rocky2008 ...

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

Its not a problem. The C language was designed like that some 35+ years ago (officially 1972).

Last edited by Ancient Dragon; May 27th, 2009 at 8:50 am.

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Re: clrscr is usually given after declaration of variables. why ?

hmmm... ok... thanks !!

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

Its not a problem. The C language was designed like that some 35+ years ago (officially 1972).

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