New program help (dieselboy extension)

**nullroute** · 11-06-2002

Registered user now..

Anyways.. back to the issue.. want to read command line input and then creat full class C network list from the input. EX.

./executable 192.168.10

creates file NETWORK-192.168.100 with all address' 1 - 255 in the file.. each address on its own line.

Is it better to first read in command line and store that in a variable.

such as

<code>
#include <stdio.h>

main()

{
int addr;
addr=scanf();

for (int step=1;step<255;step++)
{
printf "$addr.$step \n";
}
}

anyone help with what is possibly wrong here? I appreciate the direction guys..

**datainjector** · 11-06-2002

Code:

#include <stdio.h>
#include <stdlib.h>

int main( int argc , char *argv[] )
{
    int cnt_main;
    FILE *fPtr;

    if ( argc == 1 )
        printf( "Usage : IP addres e.g <190.20.0>" );
    else{

       if ( (fPtr = fopen( "network.txt" ,"w" )) != NULL ){
          for ( cnt_main = 0; cnt_main <= 255; cnt_main++ )
              fprintf(fPtr, "%s.%d\n", argv[1], cnt_main );

       fclose( fPtr );
       }
       else
          printf( "Error could not create file" );
    }

        return 0;
}

**nullroute** · 11-07-2002

Thanks for putting up this piece of code... It has helped me alot in understaning how to write C. I am now working on doing the same thing for class B address space. This is a bit harder as you have to step 1 in 3rd octet then step 255 in 4th before stepping up in the 3rd again... I will hopefully be able to figure this one out....

I appreciate all the help.. if anyone can recommend some other beginning C projects or lessons I would appreciate it.. I need to learn by doing.. it is what works best for me...

thanks again..

Ray

**Bill 101** · 11-07-2002

Hi,

Well I've posted that link to GNU C lib help and online docs, but if you don't like that, then try "The C Programming Language" (second edition) by Dennis M. Ritchie and Brian W. Kernighan. (I hope the spelling is correct..-

These gentleman are the invertors of C, so they really know everything about it. The book is very good (at least in my opinion). It contains many example programs / exercises which are helpful.

I think you can buy the book online at amazon.com.

Hope this helps!

Bye

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New program help (dieselboy extension)

Exactly what I was looking for!!

A really cool book!

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