ceil

     double ceil(double);

rounding up floating point

compile in linux with: gcc ceil.c -o ceil -lm -Wall

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <math.h> /* including math library */
 
int main ()
{
  printf ("ceil from 4.2 is %f\n", ceil (4.2) );
  return 0;
}

 output:
 user@host:~$ ./ceil 
  ceil from 4.2 is 5.000000