header file

[denny]

how can i create my own header file like provided in Turbo c.

I tried to understand the header file stdio.h i cant understand a bit.
can anyone explain.

How can i make my own datatype, which can more value than a long integer. Please give a detailed program.

[bigtamscot]

/* myheader.h */

#include <stdio.h>

typedef long int LONGINT;

/* END OF HEADER */

here is your header file, must be in the same directory as your program below...

/* MY PROG.C */

#include "myheader.h"

int main (void)
{

   LONGINT  long_value;

   printf("Enter a  whole number :");
   scanf("%ld" &long_value);

   printf("\nYou entered %ld", long_value");
   return 0;
}

[Prelude]

>How can i make my own datatype, which can more value than a long integer.
You can do this relatively easily using one of two ways: First you can create your own datatype by linking together several structs which each hold a certain length of the value. As you can imagine, the code to create and manipulate this is probably a little involved than you want. Second, you can use a double and remove the decimal when printing. This is the easiest way and it's difficult to overflow a double unless you're doing calculations that a language without value limits would be better suited for. You can also use an implementation dependent data type that is larger. Most compilers have one of these, such as MSVC++'s __int64.

>Please give a detailed program.
Heheh

#include <stdio.h>

typedef double really_long_int;

int main ( void )
{
  really_long_int rli = 1234567898765432.0;
  printf ( "%.0f\n", rli );
  return 0;
}

I'll let you write the code for the first option since it's an excellent exercise in both programming and mathematics. Or you can cheat and go to snippets.org.

-Prelude