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Full Discussion: Memory fault(coredump)
Homework and Emergencies Homework & Coursework Questions Memory fault(coredump) Post 302552520 by kermit on Sunday 4th of September 2011 07:55:43 AM
Old 09-04-2011
Code:
#include <stdio.h>

main()
{
        int c;
    int nl_cnt = 0;

        while((c = getchar()) != EOF){

                if(c == '\n'){
                nl_cnt++;
                printf("%d ", nl_cnt);}

                putchar(c);

        }

}

Quote:
Originally Posted by heywoodfloyd
how do I get the numbers and the code to line up correctly?
Your logic is a bit off. Check if c is a newline. If it is, print c, and then print a line number. Otherwise, just print c. You might also want to print a line number before your loop so that your first line is numbered.

A couple of other things:
  1. You should have warnings turned on for your compiler. This would have helped you catch your initial problem much easier. For example, if you were using gcc to compile, you would use (at minimum) the -Wall and -Wextra switches, e.g.,
    Code:
    gcc -Wall -Wextra -o myprog myprog.c

    Consult your manual pages for specific details about your system.
  2. The second is more nitpicky, but still good to know. The above program is not exactly conforming C - not to C89, and not to C99. In C89, main may be declared as above, but must have an explicit return statement. Under C99, main must be declared as one of the following:
    Code:
    int main(void)
int main(int argc, char *argv[]) /* int main(int argc, char **argv)
                             * is also acceptable
                             */

    Additionally, under C89, an explicit return at the end of main is required. In C99, it is not, and if not provided, a return value of zero is implied. Had you turned your compiler warnings on, it may have told you that you did not return a value from main in your 'cat -n' program.
 

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LEARN ABOUT CENTOS

tk_main

Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Main - main program for Tk-based applications

SYNOPSIS

       #include <tk.h>

       Tk_Main(argc, argv, appInitProc)

ARGUMENTS

       int argc (in)				  Number of elements in argv.

       char *argv[] (in)			  Array of strings containing command-line arguments.

       Tcl_AppInitProc *appInitProc (in)	  Address  of  an  application-specific  initialization procedure.  The value for this argument is
						  usually Tcl_AppInit.
_________________________________________________________________

DESCRIPTION

       Tk_Main acts as the main program for most Tk-based applications.  Starting with Tk 4.0 it is not called main anymore because it is part	of
       the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems.	Having main in the
       Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions.

       Normally each application contains a small main function that does nothing but invoke Tk_Main.  Tk_Main then does all the work of  creating
       and running a wish-like application.

       When  it  is  has  finished  its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc
       argument.  This procedure provides a "hook" for the application to perform its own initialization, such	as  defining  application-specific
       commands.  The procedure must have an interface that matches the type Tcl_AppInitProc:
	      typedef int Tcl_AppInitProc(Tcl_Interp *interp);
       AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.

KEYWORDS

       application-specific initialization, command-line arguments, main program

Tk									4.0								Tk_Main(3)
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