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please help me with this files program

This is a discussion on please help me with this files program within the C Programming forums, part of the General Programming Boards category; Please give me code for the following : The program should take one file as input which contains integers and ...

  1. #1
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    please help me with this files program

    Please give me code for the following :
    The program should take one file as input which contains integers and should take it into a int variable. lets say, print that variable on the screen.

    I wrote the following code but its showing errors..
    Code:
    # include <stdio.h>
    
    int main (int argc, int argv[1] )
    {
    FILE *file_num ;
    int num ;
    
    file_num = fopen (argv[1],"r");
      if (!file_num) 
      printf ("File not found\n");
    fscanf (file_num,"%d",&num);
    printf("%d",num);
    return ;
    }
    The programming is functioning when I replace these int types with char type but I need integers not characters.

  2. #2
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    What error?
    Check argc > 1.
    check fscanf() return value.

    main should be either
    Code:
    int main(void)
    int main(int ,char * [ ]);
    main 2nd argument is array of pointer to char.
    You are using 2nd argument of your main function as file name.
    myprogram test.txt

    argv[0] = "myprogram"
    argv[1] = "test.txt"
    Last edited by Bayint Naung; 05-11-2011 at 05:38 AM.

  3. #3
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    This is what I am getting at terminal when I execute the code.
    I even removed 1 from main (int argc, int argv[1], still this is what I 'm getting
    test.c: In function ‘main’:
    test.c:10: warning: passing argument 1 of ‘fopen’ makes pointer from integer without a cast
    /usr/include/stdio.h:249: note: expected ‘const char * __restrict__’ but argument is of type ‘int’

  4. #4
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    Hello...
    Code:
    int main (int argc, int argv[1] )
    Try...
    Code:
    int main (int argc, char *argv[])

  5. #5
    and the hat of wrongness Salem's Avatar
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    > I even removed 1 from main (int argc, int argv[1], still this is what I 'm getting
    But you didn't change the int to char did you?

    Read your C book again to see how main should be declared.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
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    Yes i did changes even that @salem

  7. #7
    and the hat of wrongness Salem's Avatar
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    Then post your latest code and latest error message(s), if you're still stuck.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  8. #8
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    @salem
    Code:
    test.c: In function ‘main’:
    test.c:10: warning: passing argument 1 of ‘fopen’ makes pointer from integer without a cast
    /usr/include/stdio.h:249: note: expected ‘const char * __restrict__’ but argument is of type ‘char’

  9. #9
    and the hat of wrongness Salem's Avatar
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    > Then post your latest code and latest error message(s), if you're still stuck.
    If this is too hard for you, try something other than programming.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  10. #10
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    I'm just curious to see how many times he has to be told it's ... char *argv[] ... before he actually changes it.

  11. #11
    and the hat of wrongness Salem's Avatar
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    I'm betting that the fopen call is now something like
    Code:
    fopen( argv[1][0], "r");
    CommonTater likes this.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  12. #12
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    Quote Originally Posted by Salem View Post
    I'm betting that the fopen call is now something like
    Code:
    fopen( argv[1][0], "r");
    Code:
    fopen (*&argv*[1][0],"%r++");
    rags_to_riches likes this.

  13. #13
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    Dear Programmers!
    I'm very sorry, first I didn't go through all your posts clearly. so, I didn't catch what you are saying. ..
    I have changed to what Mr. Salem has said char *argv[].

    @ Salem, @ CommonTater : Thanks for your great comments
    Code:
    fopen( argv[1][0], "r");
    fopen (*&argv*[1][0],"%r++");

  14. #14
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    Its working!

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