floor() Syntax

The syntax of the floor() function is:

floor(double num);

floor() Parameters

The floor() function takes the following parameters:

• num - a floating point number whose floor value is computed. It can be of the following types:
  • double
  • float
  • long double

floor() Return Value

The floor() function returns:

• the largest possible integer value which is less than or equal to num

floor() Prototypes

The prototypes of the floor() function as defined in the cmath header file are:

double floor(double num);

float floor(float num);

long double floor(long double num);

// for integral types
double floor(T num);

Example 1: C++ floor()

Output

Floor of 10.25 = 10
Floor of -34.251 = -35
Floor of 0.71 = 0

Example 2: C++ floor() for Integral Types

Output

Floor of 15 = 15

The floor of an integral value is the integral value itself, so the floor() function isn't used on integral values in practice.