Thread: ceil question

OK here is my program

Code:

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

int main(void)
{
  int tiles; /* tile size in inches */

  
printf("Enter the size of the tiles in inches > ");
scanf("%d", &tiles);

  char cont = 'Y'; 
   
  while (cont == 'Y' || cont == 'y') {
  int wid_inch;
  int wid_feet;
  int length_inch;
  int length_feet;
  int total_tiles;
  
  double length_total;
  double width_total;
  double length_tile;
  double room_tile;
  
    printf("Enter the room width (feet and inches seperated by a space): ");
    scanf("%d %d", &wid_feet, &wid_inch);
    printf("Enter the room length (feet and inches separated by a space): ");
    scanf("%d %d", &length_feet, &length_inch);
    
    width_total = (wid_feet * 12) + wid_inch;
    room_tile = width_total / tiles;
    length_total = (length_feet * 12) + length_inch;
    length_tile = length_total / tiles;
    total_tiles = room_tile * length_tile;
    printf("The %d'%d width and %d' %d length room requires %d, %d inch tiles\n\n",
            wid_feet, wid_inch, length_feet, length_inch, total_tiles, tiles);
    cont = 'a';
   }
   
return(0);   
}

I need to do a ceil for room_tile and length_tile but whenever I try to do it in anyways that seems logical the compiler goes crazy. How can I do it?

You realize you have to change "cont" in order to stop the loop, or break; out of it. Correct?

How are you using ceil()?

Code:

#include <stdlib.h>
#include <math.h>

int main(void)
{
    double x, y, d;
    printf("Enter a value for X and Y, separated by a space: ");
    scanf("%lf %lf", &x, &y);
    if (y != 0)
    {
        d = x / y;
        printf("%lf / %lf = %lf (which rounds to %lf)\n", x, y, d, ceil(d));
    }
    else
    {
        printf("%lf / %lf is undefined (divide by zero)\n", x, y);
    }
    return 0;
}

should work just fine. You do have to link with libm, however, which means using a command line that looks like:

Code:

cc -lm -o progexe progfile.c

I hope this helps.

Whenever I do

Code:

      room_tile = ceil(width_total / tiles);
      /* ... */
      length_tile = ceil(length_total / tiles);

I get the following error



Undefined first referenced
symbol in file
ceil /var/tmp//ccF2dmzA.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Originally Posted by 1rwhites

Whenever I do
Undefined first referenced
symbol in file
ceil /var/tmp//ccF2dmzA.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

This is because you're not putting the "-lm" (which links against the math library, libm) on the cc command line. The error is a linker error, not a compiler error.

Read my reply, above, again.

Dear filker0,
If you were anywhere near me I would kiss you!

Thanks a lot. It works fine.

You're quite welcome.

I always try to be helpful unless I think it's someone trying to get their homework done by someone else, and even then, I'll give hints.