6.11.62 floor Function

Calculates the floor of a double precision floating-point value.

Include

<math.h>

Prototype

double floor (double x);

Argument

x

floating-point value for which to return the floor

Return Value

Returns the largest integer value less than or equal to x.

Remarks

No domain or range error will occur. See ceil.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

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

int main(void)
{
  double x[8] = {2.0, 1.75, 1.5, 1.25, -2.0, 
                 -1.75, -1.5, -1.25};
  double y;
  int i;

  for (i=0; i<8; i++)
  {
    y = floor (x[i]);
    printf("The ceiling for %f is %f\n", x[i], y);
  }
}

Example Output

The  floor for 2.000000 is 2.000000
The  floor for 1.750000 is 1.000000
The  floor for 1.500000 is 1.000000
The  floor for 1.250000 is 1.000000
The  floor for -2.000000 is -2.000000
The  floor for -1.750000 is -2.000000
The  floor for -1.500000 is -2.000000
The  floor for -1.250000 is -2.000000