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Hi,
I have a text file abc.txt and it looks like:
12 34 56
23 45 56
33 56 78
... .. ..
... .. ..

I want to get how many rows totally in the text file, how to do this?
Thanks.

Wei Su schreef:

> Hi,
> I have a text file abc.txt and it looks like:
> 12 34 56
> 23 45 56
> 33 56 78
> .. .. ..
> .. .. ..
>
> I want to get how many rows totally in the text file, how to do this?
> Thanks.

You could count the numbers of linebreaks.

please show some details. thanks

ThunderBird wrote:
> please show some details. thanks

Please show some context so people have a clue as to what you are
balking about.

Robert Gamble.

it mentioned "You could count the numbers of linebreaks. ". My question
is how to count the numbers of linebreaks?
TB

----- Original Message -----
From: "ThunderBird" <>
Newsgroups: comp.lang.c
Sent: Thursday, August 11, 2005 1:14 PM
Subject: Re: How to get the total row number of a text file


> it mentioned "You could count the numbers of linebreaks. ". My question
> is how to count the numbers of linebreaks?
> TB
>

This works for me...

cmreinke@hologram>cat lines.c
/* lines.c */
#include <stdio.h>

int main(int argc, char **argv) {
long lines=0;
FILE *fp;

if(argc>1) {
if((fp=fopen(argv[1], "r"))) {
while(fscanf(fp, "%*[^\n]\n")!=EOF) lines++;
printf("Number of lines in file \"%s\": %ld\n", argv[1], lines);
} /* if */
else printf("ERROR: could not open file \"%s\"\n", argv[1]);
} /* if */
else printf("ERROR: no input file specified\n");

return 0;
} /* main */
/* lines.c */

cmreinke@hologram>gcc -Wall -ansi -pedantic -o lines.exe lines.c
cmreinke@hologram>lines.exe output2
Number of lines in file "output2": 270

-Charles

This is a kind of tricky question, different os use different
combinations to get the newline.
Windows: \r\n
Unix: \n
Mac: \r . it said to be, I have never used a Mac machine. However, the
text file transfered between M$'s os and Unix, I dit get some trouble
with the carriage return and line feed.

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

static const char *prog_name="wcn";

int
main(int argc, char *argv[]) {
FILE *fp;
int i;

if (argc == 1) {
printf("Usage: %s [files]\n", prog_name);
exit(EXIT_FAILURE);
}

for (i=1; i<argc; ++i) {
unsigned int r_c=0, n_c=0, rn_c=0;
int c, last=0;
if (! (fp=fopen(argv[i], "rb"))) {
printf("%s: %s: %s\n", prog_name, argv[i], strerror(errno));
continue;
}


while ((c=fgetc(fp)) != EOF) {
if (c == '\n') {
++n_c;
if (last == '\r')
++rn_c;
} else if (last == '\r')
++r_c;
last = c;
}
r_c += last=='\r'; /* In case the last char is '\r' */

if (ferror(fp)) {
printf("%s: %s: %s\n", prog_name, argv[i], strerror(errno));
if (fclose(fp) == EOF)
perror(prog_name);
continue;
}
if (fclose(fp) == EOF)
printf("%s: %s: %s\n", prog_name, argv[i], strerror(errno));
printf("%s:\t \\n: %u\t \\r: %u\t \\r\\n: %u\n", argv[i], n_c, r_c,
rn_c);
}
exit(EXIT_SUCCESS);
}

In article < .com>,
moxm <> wrote:
>This is a kind of tricky question, different os use different
>combinations to get the newline.
>Windows: \r\n
>Unix: \n
>Mac: \r . it said to be, I have never used a Mac machine. However, the
>text file transfered between M$'s os and Unix, I dit get some trouble
>with the carriage return and line feed.

> if (! (fp=fopen(argv[i], "rb"))) {

If you do not open in binary mode, then the local OS's internal convention
will be transformed into \n when the data is read.

If you are trying to deal with files that have been copied from other
OS's then the first line of defence is to copy them in text mode instead
of binary mode.
--
"No one has the right to destroy another person's belief by
demanding empirical evidence." -- Ann Landers

Charles' code is very clean and elegant, I think it works well in
windows and unix , but what if the newline character is just '\r' at a
Mac machine.

Sorry! I am idiot, just open the file in text mode is okay like Walter
Roberson said.