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floor

Round to largest integral value not greater than x

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Contents

Interface
Description
Special Values
See Also
Standards
Page Comments

Interface

#include <math.h>

	double	`floor` (double x)
	long	`floorl` (long double x)
	float	`floorf` (float x)

Description

The floor functions return the largest integral value less than or equal to x.

Example 1:

#include <stdio.h>
#include <math.h>
 
int main(void)
{
  for (double a = 12.5; a < 13.4; a += 0.1)
    printf("floor of  %.1lf is  %.1lf\n", a, floor(a));
  return 0;
}

Output:

floor of  12.5 is  12.0
floor of  12.6 is  12.0
floor of  12.7 is  12.0
floor of  12.8 is  12.0
floor of  12.9 is  12.0
floor of  13.0 is  13.0
floor of  13.1 is  13.0
floor of  13.2 is  13.0
floor of  13.3 is  13.0
floor of  13.4 is  13.0

Special Values

floor ( ±0 ) returns ±0.
floor ( ±∞ ) returns ±∞.

Standards

The floor functions conform to ISO/IEC 9899:1999(E).

Last Modified: 2009-11-01 08:41:18 Page Rendered: 2010-03-14 00:40:07

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