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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 ULTRIX

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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