What is the floor() function in D?

Overview

The floor() function in D returns the next largest integer that is less than or equal to a specified number.

Figure 1 shows the mathematical representation of the floor() function.

Figure 1: Mathematical representation of the "floor()" function

Note: We need to import std.math in our code in order to use the floor() function. We can import it like this:
import std.math

Syntax

floor(number)
// number should be float, double or real.

Parameter

This function requires a number as a parameter.

Return value

The floor() function returns the next largest integer that is less than or equal to the number set as a parameter.

Note: If -0.0, real.infinity, -real.infinity, real.nan, or -real.nan is sent as a parameter, then the function returns the parameter as it is.

Code example

The code written below demonstrates the use of the floor() function in D:

import core.stdc.stdio;
import std.stdio;
//header required for function
import std.math;
int main()
{
    //integer
    writeln ("The value of floor(4.0) : ",floor(4.0));
    //positive double value
    writeln ("The value of floor(2.56) : ",floor(2.56));
    //negative double value
    writeln ("The value of floor(-2.56) : ",floor(-2.56));
    //exceptional outputs
    writeln ("The value of floor(-0.0) : ",floor(-0.0));
    writeln ("The value of floor(real.infinity) : ",floor(real.infinity));
    writeln ("The value of floor(-real.infinity) : ",floor(-real.infinity));
    writeln ("The value of floor(real.nan) : ",floor(real.nan));
    writeln ("The value of floor(-real.nan) : ",floor(-real.nan));
    return 0;
}

Code explanation

  • Line 4: We add the header std.math, which is required for the floor() function.

  • Line 9: We calculate the floor of the integer value, using the floor() function.

  • Line 12: We calculate the floor of the positive double value, using the floor() function.

  • Line 15: We calculate the floor of the negative double value, using the floor() function.

  • Lines 18–25: We calculate the floor of the exceptional numbers, using the floor() function.

Free AI Mock Interviews
Coding Interview
Coding PatternsFree Interview
Gain insights and practical experience with coding patterns through targeted MCQs and coding problems, designed to match and challenge your expertise level.
System Design
You TubeFree Interview
Learn to design a video streaming platform like YouTube by tackling functional and non-functional requirements, core components, and high-level to detailed design challenges.

Free Resources

License: Creative Commons-Attribution-ShareAlike 4.0 (CC-BY-SA 4.0)