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_mathNumSys, only: getCountDigit
use pm_kind, only: IK
integer(IK) :: count
 
count = getCountDigit(val)

Remarks

The procedures under discussion are pure.

The procedures under discussion are elemental.

See also

getCountDigit

Example usage ⛓

program example
 
    use pm_kind, only: SK, IK
    use pm_kind, only: IKS, IKD ! all integer kinds are supported.
    use pm_io, only: display_type
    use pm_mathNumSys, only: getCountDigit
 
    implicit none
 
    integer(IKD), allocatable :: IntList(:)
 
    integer(IK) :: i
    type(display_type) :: disp
    disp = display_type(file = "main.out.F90")
 
    call disp%skip()
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%show("! Compute the number of digits in a given integer.")
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%skip()
 
    call disp%skip()
    call disp%show("getCountDigit(5_IKS)")
    call disp%show( getCountDigit(5_IKS) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("getCountDigit(5_IKD)")
    call disp%show( getCountDigit(5_IKD) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("[-huge(0_IKS), huge(0_IKS)]")
    call disp%show( [-huge(0_IKS), huge(0_IKS)] )
    call disp%show("getCountDigit([-huge(0_IKS), huge(0_IKS)])")
    call disp%show( getCountDigit([-huge(0_IKS), huge(0_IKS)]) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("[-huge(0_IKD), huge(0_IKD)]")
    call disp%show( [-huge(0_IKD), huge(0_IKD)] )
    call disp%show("getCountDigit([-huge(0_IKD), huge(0_IKD)])")
    call disp%show( getCountDigit([-huge(0_IKD), huge(0_IKD)]) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("IntList = [(2_IKD**i, i = 0, 63, 16)]")
                    IntList = [(2_IKD**i, i = 0, 63, 16)]
    call disp%show("IntList")
    call disp%show( IntList )
    call disp%show("getCountDigit(IntList)")
    call disp%show( getCountDigit(IntList) )
    call disp%skip()
 
end program example

Example Unix compile command via Intel ifort compiler ⛓

#!/usr/bin/env sh
rm main.exe
ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example Windows Batch compile command via Intel ifort compiler ⛓

del main.exe
set PATH=..\..\..\lib;%PATH%
ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
main.exe

Example Unix / MinGW compile command via GNU gfortran compiler ⛓

#!/usr/bin/env sh
rm main.exe
gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example output ⛓

 
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
! Compute the number of digits in a given integer.
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 
getCountDigit(5_IKS)
+1
 
 
getCountDigit(5_IKD)
+1
 
 
[-huge(0_IKS), huge(0_IKS)]
-2147483647, +2147483647
getCountDigit([-huge(0_IKS), huge(0_IKS)])
+10, +10
 
 
[-huge(0_IKD), huge(0_IKD)]
-9223372036854775807, +9223372036854775807
getCountDigit([-huge(0_IKD), huge(0_IKD)])
+19, +19
 
 
IntList = [(2_IKD**i, i = 0, 63, 16)]
IntList
+1, +65536, +4294967296, +281474976710656
getCountDigit(IntList)
+1, +5, +10, +15
 
 

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.

Copyright

Computational Data Science Lab

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:

• src/fortran/main/pm_mathNumSys.F90