Like Tree1Likes
  • 1 Post By smokeyangel

how to stop reading char???

This is a discussion on how to stop reading char??? within the C Programming forums, part of the General Programming Boards category; Hello everybody i m using visual studio 2012.....in below code i m writing data in to a test.txt file but ...

  1. #1
    Registered User
    Join Date
    Jan 2013
    Posts
    14

    Unhappy how to stop reading char???

    Hello everybody i m using visual studio 2012.....in below code i m writing data in to a test.txt file but i dont know with which key file stop accepting char...i tried ctrl+z and ctrl+d but not working plzz help meee....
    Code:
    #include<stdio.h>
    #include<conio.h>
    
    
    main()
    {
    	char ch;
    	FILE *ptr;
    	ptr=fopen("test.txt","w");
    	printf("enter data for file\n");
    	while((ch=getchar())!=EOF)
    	{
    		fputc(ch,ptr);
    	}
    	fclose(ptr);
    	getch();
    }

  2. #2
    Registered User
    Join Date
    Jun 2005
    Posts
    6,660
    Under windows the keystroke is CTRL-Z, repeated twice.

    Preferably, given your code, after a end of line (carriage return) is entered.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  3. #3
    Registered User
    Join Date
    Jan 2013
    Posts
    14
    Quote Originally Posted by grumpy View Post
    Under windows the keystroke is CTRL-Z, repeated twice.

    Preferably, given your code, after a end of line (carriage return) is entered.
    not working dude...

  4. #4
    Registered User
    Join Date
    Jun 2005
    Posts
    6,660
    Ah - it also depends on the implementation of getchar(). Try CTRL-Z followed by carriage return. (depending on implementation of getchar(), keystrokes - even CTRL-Z which is the EOF sentinel - will be buffered until a carriage return is encountered).
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  5. #5
    Registered User
    Join Date
    Mar 2010
    Posts
    535
    I think it's because you're using a char to store the result of getchar(). getchar() returns an int. EOF is -1, which can't be represented by a char.

    Try changing ch to int.

    I'm pretty sure CTRL-Z is the right key sequence -- do it a few times then hit enter and it should die.
    jwroblewski44 likes this.

  6. #6
    Registered User
    Join Date
    Feb 2013
    Posts
    22
    I think the problem is because you're using EOF to check a character, try
    Code:
    while((ch=getchar())!='0')
    instead of
    Code:
    while((ch=getchar())!=EOF)
    I think you'll find that the program exits after you enter 0 and press another key(because of the getch)

    Hope I was helpful!!
    Last edited by Dakshin; 02-23-2013 at 08:13 AM.

  7. #7
    Registered User
    Join Date
    Jan 2013
    Posts
    14
    thanks everyone now its working....it was not working because of getch() function it was needed two enter for exit...

  8. #8
    young grasshopper jwroblewski44's Avatar
    Join Date
    May 2012
    Location
    Where the sidewalk ends
    Posts
    294
    Code:
    #include <stdio.h>
    
    main()
    {
        int ch;   //char to int
        FILE *ptr;
        ptr = fopen( "test.txt" , "w" );
        printf( "enter data for file\n" );
        while((ch=getchar())!=EOF)
        {
            fputc(ch,ptr);
        }
        fclose(ptr);
    }
    

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. stop reading until newline in file pointer
    By ulti-killer in forum C Programming
    Replies: 4
    Last Post: 11-09-2012, 01:52 PM
  2. How to stop reading input...
    By intull in forum C Programming
    Replies: 8
    Last Post: 02-20-2011, 03:38 AM
  3. fputs doesn' t stop reading when \0 is found?
    By brack in forum C Programming
    Replies: 5
    Last Post: 09-03-2010, 11:43 AM
  4. Replies: 2
    Last Post: 10-18-2009, 02:05 PM
  5. Stop reading from a file
    By Zalbik in forum C++ Programming
    Replies: 2
    Last Post: 12-05-2002, 05:58 PM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21