<= argument

floor -- Integer <= Argument

Format

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

Language Level: ANSI, POSIX, XPG4
floor calculates the largest integer that is less than or equal to x.

Return Value
floor returns the floating-point result as a double value.

The result of floor cannot have a range error.

Example
This example assigns y value of the largest integer less than or equal to 2.8 and z the value of the largest integer less than or equal to -2.8.

#include <math.h>
#include <stdio.h>
int main(void)
{
   double y, z;
   y = floor(2.8);
   z = floor(-2.8);
   printf("floor(  2.8 ) = %lf\n", y);
   printf("floor( -2.8 ) = %lf\n", z);
   return 0;
   /******************************************
      The output should be:
      floor(  2.8 ) = 2.000000
      floor( -2.8 ) = -3.000000
   ******************************************/
}


ceil -- Find Integer >= Argument
fmod -- Calculate Floating-Point Remainder
<math.h>