Help with strtod and fgets..

This is a discussion on Help with strtod and fgets.. within the C Programming forums, part of the General Programming Boards category; Hey I need help with strtod, can anybody help me..? I need to read a lot of coordinates from a ...

  1. #1
    Registered User
    Join Date
    Mar 2002

    Help with strtod and fgets..

    I need help with strtod, can anybody help me..?

    I need to read a lot of coordinates from a file, whicj will be
    translatet into double with strtod, and make a circle move
    around the screen, with the coordinates from the file.
    But i'm a bit unsure, how to use strtod and read the date from the file.
    I have x and y, which shall make the circle go.
    Can anybody give me some directions about fgets and how to
    get the coordinates into the right x and y coordinates..

    ------------code ---------------------
    x = 150.0;
    y = 200.0;

    drawCircle(x, y, BLACK);
    drivecoord = fopen("xycoord.txt","r");

    printf("FEJL - Filen kunne ikke findes.\n");
    return 0;

    quitCheck ();

    value = strtod(coord, &endptr);

    printf("The string is %s the number is %lf\n", coord, value);

    drawCircle(x, y, BLACK);


  2. #2
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    don't do this! It'll give you trouble. Do a board search on how to check the return code of fgets() to properly determine when to stop reading a file.

    Haven't look at your question though <sorry>!
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    and the hat of wrongness Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    If you have pairs of coordinates on the same line, then try

    while ( fgets(coord,sizeof(coord),drivecoord) != NULL ) {
      x = strtod(coord, &endptr);
      y = strtod(endptr,NULL);
      drawCircle(x, y, BLACK); 

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