Help with strtod and fgets..

**Gugge** · 05-15-2002

Hey
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..

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

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

if(!drivecoord)
{
printf("FEJL - Filen kunne ikke findes.\n");
return 0;
}

while(!feof(drivecoord))
{
quitCheck ();

fgets(coord,80,drivecoord);
value = strtod(coord, &endptr);

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

drawCircle(x, y, BLACK);

}
---------------------------

**Hammer** · 05-15-2002

>while(!feof(drivecoord))
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>!

**Salem** · 05-15-2002

If you have pairs of coordinates on the same line, then try

Code:

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

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