floor, floorl

raw OCR

Rounds down.

Defined in header <math.h>

Syntax

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

Portability

	DOS	UNIX	Windows	ANSI C	C++ only
floor	■	■	■	■
	■		■

Remarks

floor finds the largest integer not greater than x. floorl is the long double version; it takes a long double argument and returns a long double result.

Return value

floor returns the integer found as a double. floorl returns the integer found as a long double.

Example

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

int main(void)
{
   double number = 123.54, down,  up;

   down = floor (number);
   up = ceil (number);
   printf("original number      %10.21f\n", number);
   printf("number rounded  doivn %10.21f\n", down);
   printf("number rounded up    U0.21f\n",  up);
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

These are search links, not yet checked by hand.

Stable link: /3.1/math.h/floor/ · short form /3.1/floor/