Syntax

#include <math.h>
double ceil(double x);

ceil computes the smallest integer that is greater than or equal to x.

ceil returns the integer as a double value.

This example sets y to the smallest integer greater than 1.05, and then to the smallest integer greater than -1.05. The results are 2.0 and -1.0, respectively.

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

int main(void)
{
   double y,z;

   y = ceil(1.05);                                        /* y = 2.0          */
   printf("ceil( 1.05 ) = %5.f\n", y);
   z = ceil(-1.05);                                       /* z = -1.0         */
   printf("ceil( -1.05 ) = %5.f\n", z);
   return 0;

   /****************************************************************************
      The output should be:

      ceil( 1.05 ) =     2
      ceil( -1.05 ) =    -1
   ****************************************************************************/
}

• floor
  
• fmod

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