Usage and example of C library function floor()

C Standard Library <math.h>

double floor(double x) returns the largest integer less than or equal to x.

C floor() prototype

double floor(double arg)

The floor() function takes a single parameter and returns a value of type double.

It is<math.h>Defined in the header file.

For example:

If you put2.3Passed to floor(), it will return2.

To calculate the floor() of long double or float, you can use the following prototype.

long double floorl(long double arg);
float floorf(float arg);

Example: C floor() function

#include <stdio.h>
#include <math.h>
int　main()
{
　　　　float　val1,　val2,　val3,　val4;
　　　　val1　=　9.6;
　　　　val2　=　9.2;
　　　　val3　=　-5.8;
　　　　val4　=　-5.3;
　　　　printf("Floor1　=　%.1lf\n",　floor(val1));
　　　　printf("Floor2　=　%.1lf\n",　floor(val2));
　　　　//Note Negative Numbers
　　　　printf("Floor3　=　%.1lf\n",　floor(val3));
　　　　printf("Floor4　=　%.1lf\n",　floor(val4));
　　　　return(0);
}

Output Result

Floor1　=　9.0
Floor2　=　9.0
Floor3　=　-6.0
Floor4　=　-6.0

C Standard Library <math.h>