ParaMonte Fortran 2.0.0
Parallel Monte Carlo and Machine Learning Library
See the latest version documentation.
pm_mathNumSys::getCountDigit Interface Reference

Generate and return the number of digits in the input integer. More...

Detailed Description

Generate and return the number of digits in the input integer.

The number of digits of an integer is independent of its sign.
For example, both 100 and -100 have three digits in base 10.

Parameters
[in]val: The input scalar or array of arbitrary rank of type integer of kind any supported by the processor (e.g., IK, IK8, IK16, IK32, or IK64) containing the integer whose number of digits is to be computed on return.
Note that val has the value attribute in the procedure interfaces.
Returns
count : The output scalar or array of the same shape as the input val of type integer od default kind IK, containing the number of digits of the input integer val.


Possible calling interfaces

use pm_kind, only: IK
integer(IK) :: count
count = getCountDigit(val)
Generate and return the number of digits in the input integer.
This module defines the relevant Fortran kind type-parameters frequently used in the ParaMonte librar...
Definition: pm_kind.F90:268
integer, parameter IK
The default integer kind in the ParaMonte library: int32 in Fortran, c_int32_t in C-Fortran Interoper...
Definition: pm_kind.F90:540
This module contains procedures and generic interfaces for converting numbers to different bases in d...
Remarks
The procedures under discussion are pure.
The procedures under discussion are elemental.
See also
getCountDigit


Example usage

1program example
2
3 use pm_kind, only: SK, IK
4 use pm_kind, only: IKS, IKD ! all integer kinds are supported.
5 use pm_io, only: display_type
7
8 implicit none
9
10 integer(IKD), allocatable :: IntList(:)
11
12 integer(IK) :: i
13 type(display_type) :: disp
14 disp = display_type(file = "main.out.F90")
15
16 call disp%skip()
17 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
18 call disp%show("! Compute the number of digits in a given integer.")
19 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
20 call disp%skip()
21
22 call disp%skip()
23 call disp%show("getCountDigit(5_IKS)")
24 call disp%show( getCountDigit(5_IKS) )
25 call disp%skip()
26
27 call disp%skip()
28 call disp%show("getCountDigit(5_IKD)")
29 call disp%show( getCountDigit(5_IKD) )
30 call disp%skip()
31
32 call disp%skip()
33 call disp%show("[-huge(0_IKS), huge(0_IKS)]")
34 call disp%show( [-huge(0_IKS), huge(0_IKS)] )
35 call disp%show("getCountDigit([-huge(0_IKS), huge(0_IKS)])")
36 call disp%show( getCountDigit([-huge(0_IKS), huge(0_IKS)]) )
37 call disp%skip()
38
39 call disp%skip()
40 call disp%show("[-huge(0_IKD), huge(0_IKD)]")
41 call disp%show( [-huge(0_IKD), huge(0_IKD)] )
42 call disp%show("getCountDigit([-huge(0_IKD), huge(0_IKD)])")
43 call disp%show( getCountDigit([-huge(0_IKD), huge(0_IKD)]) )
44 call disp%skip()
45
46 call disp%skip()
47 call disp%show("IntList = [(2_IKD**i, i = 0, 63, 16)]")
48 IntList = [(2_IKD**i, i = 0, 63, 16)]
49 call disp%show("IntList")
50 call disp%show( IntList )
51 call disp%show("getCountDigit(IntList)")
52 call disp%show( getCountDigit(IntList) )
53 call disp%skip()
54
55end program example
This is a generic method of the derived type display_type with pass attribute.
Definition: pm_io.F90:11726
This is a generic method of the derived type display_type with pass attribute.
Definition: pm_io.F90:11508
This module contains classes and procedures for input/output (IO) or generic display operations on st...
Definition: pm_io.F90:252
type(display_type) disp
This is a scalar module variable an object of type display_type for general display.
Definition: pm_io.F90:11393
integer, parameter IKS
The single-precision integer kind in Fortran mode. On most platforms, this is a 32-bit integer kind.
Definition: pm_kind.F90:563
integer, parameter IKD
The double precision integer kind in Fortran mode. On most platforms, this is a 64-bit integer kind.
Definition: pm_kind.F90:564
integer, parameter SK
The default character kind in the ParaMonte library: kind("a") in Fortran, c_char in C-Fortran Intero...
Definition: pm_kind.F90:539
Generate and return an object of type display_type.
Definition: pm_io.F90:10282

Example Unix compile command via Intel ifort compiler
1#!/usr/bin/env sh
2rm main.exe
3ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
4./main.exe

Example Windows Batch compile command via Intel ifort compiler
1del main.exe
2set PATH=..\..\..\lib;%PATH%
3ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
4main.exe

Example Unix / MinGW compile command via GNU gfortran compiler
1#!/usr/bin/env sh
2rm main.exe
3gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
4./main.exe

Example output
1
2!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3! Compute the number of digits in a given integer.
4!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
5
6
7getCountDigit(5_IKS)
8+1
9
10
11getCountDigit(5_IKD)
12+1
13
14
15[-huge(0_IKS), huge(0_IKS)]
16-2147483647, +2147483647
17getCountDigit([-huge(0_IKS), huge(0_IKS)])
18+10, +10
19
20
21[-huge(0_IKD), huge(0_IKD)]
22-9223372036854775807, +9223372036854775807
23getCountDigit([-huge(0_IKD), huge(0_IKD)])
24+19, +19
25
26
27IntList = [(2_IKD**i, i = 0, 63, 16)]
28IntList
29+1, +65536, +4294967296, +281474976710656
30getCountDigit(IntList)
31+1, +5, +10, +15
32
33
Test:
test_pm_mathNumSys
Todo:
Normal Priority: The performance of this algorithm can be improved by invoking the proper approach to computing the number of digits.


Final Remarks


If you believe this algorithm or its documentation can be improved, we appreciate your contribution and help to edit this page's documentation and source file on GitHub.
For details on the naming abbreviations, see this page.
For details on the naming conventions, see this page.
This software is distributed under the MIT license with additional terms outlined below.

  1. If you use any parts or concepts from this library to any extent, please acknowledge the usage by citing the relevant publications of the ParaMonte library.
  2. If you regenerate any parts/ideas from this library in a programming environment other than those currently supported by this ParaMonte library (i.e., other than C, C++, Fortran, MATLAB, Python, R), please also ask the end users to cite this original ParaMonte library.

This software is available to the public under a highly permissive license.
Help us justify its continued development and maintenance by acknowledging its benefit to society, distributing it, and contributing to it.

Author:
Amir Shahmoradi, April 23, 2017, 1:36 AM, Institute for Computational Engineering and Sciences (ICES), University of Texas at Austin

Definition at line 620 of file pm_mathNumSys.F90.


The documentation for this interface was generated from the following file: