NAG Library Manual, Mark 30.1
Interfaces:  FL   CL   CPP   AD   PY   MB 
NAG CPP Interface Introduction
X02 (Machine) Chapter Contents
x02aj:  FL   CL   CPP   AD   PY   MB 
Namespace: nagcpp
Namespace: machine
Function: precision

NAG CPP Interface
nagcpp::machine::precision (x02aj)

NAG Library Manual, Mark 30.1
Interfaces:  FL   CL   CPP   AD   PY   MB 
NAG CPP Interface Introduction
X02 (Machine) Chapter Contents
x02aj:  FL   CL   CPP   AD   PY   MB 
Namespace: nagcpp
Namespace: machine
Function: precision

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2024
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1 Purpose

precision returns ε, the value machine precision.

2 Specification 

#include "x02/nagcpp_x02aj.hpp"

double precision()

3 Description

precision returns machine precision, computed as ε = 12 × b1-p , where b is the arithmetic base (see x02bhf (no CPP interface)) and p is the number of significant base-b digits (see x02bjf (no CPP interface)).
It is important to note that the definition of ε here differs from that in ISO Fortran 95 (1997).

4 References

ISO Fortran 95 (1997) ISO Fortran 95 programming language (ISO/IEC 1539–1:1997)

5 Arguments

None.

6 Exceptions and Warnings

None.

7 Accuracy

Not applicable.

8 Parallelism and Performance

Please see the description for the underlying computational routine in this section of the FL Interface documentation.

9 Further Comments

None.

10 Example

Examples for the NAG CPP Interface are not currently available.
NAG Library Manual, Mark 30.1
Interfaces:  FL   CL   CPP   AD   PY   MB 
NAG CPP Interface Introduction
X02 (Machine) Chapter Contents
x02aj:  FL   CL   CPP   AD   PY   MB 
Namespace: nagcpp
Namespace: machine
Function: precision
© The Numerical Algorithms Group Ltd. 2024