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From Linux to Windows - problem

This is a discussion on From Linux to Windows - problem within the C Programming forums, part of the General Programming Boards category; Hi. I wrote some code like this: Code: FILE * plik; plik = fopen("plik.in", "r"); fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy); fclose(plik); and ...

  1. #1
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    From Linux to Windows - problem

    Hi. I wrote some code like this:
    Code:
    FILE * plik;
    
    
    plik = fopen("plik.in", "r");
    fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy);
    fclose(plik);
    and plik.in looks like that:
    (0,0),(2,0),(3,3),(0,2)

    On the Linux platform everything is ok, but the same on windows doesn't work. Have anyone any idea why?

  2. #2
    Registered User TheBigH's Avatar
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    Can you show your whole code? What errors are you getting?
    Code:
    while(!asleep) {
       sheep++;
    }

  3. #3
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    There are no errors. I can compile the code but after this, program simply doesn't work. Function fscanf loads strange values.
    Code:
    #include <stdio.h>
    #include <math.h>
    
    
    //po podaniu współrzednch punktu funkcja oblicza długość odcinka
    double oblicz_dlugosc_boku(int wspolrzedna_x, int wspolrzedna_y, int wspolrzedna_x2, int wspolrzedna_y2)
    {
    	//zastosowanie twierdzenia pitagorasa do obliczania długości boków
    	double dlugosc_boku = sqrt(((wspolrzedna_x - wspolrzedna_x2)*(wspolrzedna_x - wspolrzedna_x2)) + ((wspolrzedna_y - wspolrzedna_y2)*(wspolrzedna_y - wspolrzedna_y2)));
    	return dlugosc_boku;
    }
    
    
    double oblicz_pole(double a, double b, double c)
    {
    	//obliczanie obwodu
    	double p = (a+b+c)/2;
    	//wykorzystanie wzoru Herona do obliczenia pola trĂłjkÄ…ta i zaokrÄ…glenie wyniku do 4 miejsca po przecinku 
    	double pole = round(10000 * sqrt(p*(p-a)*(p-b)*(p-c)))/10000;
    	return pole;
    }
    
    
    int main ()
    {
    system("chcp 1250");
    
    
    int ax,ay,bx,by,cx,cy,dx,dy;
    double AC,BD,AB,BC,AD,CD,pABC,pACD,pABD,pBCD;
    
    
    FILE * plik;
    
    
    plik = fopen("czworokat.in", "r");
    //wczytywanie kolejnych współrzednych
    fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy);
    ///////////////////////////////////////
    printf("%d,%d,%d,%d,%d,%d,%d,%d\n", ax,ay,bx,by,cx,cy,dx,dy);// look at this values, thats what im talking about
    //////////////////////////////////////
    //zamknięcie strumienia
    fclose(plik);
    
    
    //OBLICZANIE DŁUGOŚĆI PRZEKĄTNYCH AC,BD
    AC = oblicz_dlugosc_boku(ax,ay,cx,cy);
    BD = oblicz_dlugosc_boku(dx,dy,bx,by);
    //OBLICZANIE DŁUGOŚCI BOKÓW AB,BC,CD,AD
    AB = oblicz_dlugosc_boku(ax,ay,bx,by);
    BC = oblicz_dlugosc_boku(bx,by,cx,cy);
    CD = oblicz_dlugosc_boku(cx,cy,dx,dy);
    AD = oblicz_dlugosc_boku(ax,ay,dx,dy);
    //OBLICZANIE PĂ“L TRĂ“JKÄ„TĂ“W
    pABC = oblicz_pole(AB, BC, AC);
    pACD = oblicz_pole(AC, CD, AD);
    pABD = oblicz_pole(AB, BD, AD);
    pBCD = oblicz_pole(BC, CD, BD);
    
    
    //SPRAWDZANIE CZY POLA SUMY PĂ“L TRĂ“JKÄ„TĂ“W SÄ„ RĂ“WNE
    if((pABC + pACD) == (pABD + pBCD))
    {
    	printf("TAK! Ten czworokąt jest wypukły!\n");
    }
    else
    {
    	printf("NIE! To nie jest czworokąt wypukły!\n %d", ax);
    }
    int i;
    scanf("%d", &i);
    return 0;
    }

  4. #4
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    What does this do "system("chcp 1250");"?
    Is there any reason to believe it does the same thing in Windows?

    Edit: From this site, it appears to be a valid Windows command; but, not sure it does what is needed.
    windows XP command line encoding - Super User

    Tim S.
    Last edited by stahta01; 04-03-2013 at 07:34 PM.
    "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to produce bigger and better idiots. So far, the Universe is winning." Rick Cook

  5. #5
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    Command system("chcp 1250") is for Polish chars in console. I added it on Windows, but it didnt make any difference.

    Any thoughts what is with this miserable fscanf? ;<

  6. #6
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    I suggest checking the return value of fopen to see if it failed.
    Then, checking the return value of fscanf.

    Tim S.
    Salem likes this.
    "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to produce bigger and better idiots. So far, the Universe is winning." Rick Cook

  7. #7
    TEIAM - problem solved
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    You should check to see if fopen did not return NULL before using you open file.

    Maybe it might be worth using fgets with sscanf, so that you can see what is happening.
    Fact - Beethoven wrote his first symphony in C

  8. #8
    TEIAM - problem solved
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    I might also have something to do with the format that your text document is in - Someone might be able to fill in whether you need wide char functions
    Fact - Beethoven wrote his first symphony in C

  9. #9
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    Already done that for fscanf. Result is pretty interesting. In place of ints from (0,0),(2,0),(3,3),(0,2) I have Name:  s0wlfb.jpg
Views: 54
Size:  12.3 KB in 2nd line is false result from if.

    How to check return value of fopen ?

  10. #10
    TEIAM - problem solved
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    if (plik == NULL) -> Failed.
    Fact - Beethoven wrote his first symphony in C

  11. #11
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    With file is everything ok. For me fscanf is curious, i dont get the result it gives.

  12. #12
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    What is the output of
    Code:
    int n = fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy); 
    printf("items read: %d\n", n);
    What is the output of (immediately after opening the file)
    Code:
    int ch;
    while ((ch = getc(plik)) != EOF)
        printf("%c - %d - %x\n", ch, ch, ch);
    Bye, Andreas

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