What is the ceil() function in D?

Overview

The ceil() function returns the nearest smallest integer value that is greater than or equal to a number.

The figure below shows the mathematical representation of the ceil() function:

Mathematical representation of ceil() function

Note: We need to import std.math in our code to use the ceil() function. We can import it by using:
import std.math

Syntax

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

Parameter

This function requires a number as a parameter.

Return value

ceil() returns the nearest, smallest integer value greater than or equal to a number sent as a parameter.

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

Example

The code below shows the use of the ceil() function in D:

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

Explanation

In the code above:

  • Line 4: We add the header std.math required for ceil() function.

  • Line 9: We calculate the ceiling of the integer value using ceil().

  • Line 12: We calculate the ceiling of the positive double value using ceil().

  • Line 15: We calculate the ceiling of the negative double value using ceil().

  • Lines 19 to 23: We calculate the ceiling of exceptional numbers using ceil().

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