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 ⛓
integer(IK) :: count
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...
integer, parameter IK
The default integer kind in the ParaMonte library: int32 in Fortran, c_int32_t in C-Fortran Interoper...
This module contains procedures and generic interfaces for converting numbers to different bases in d...
- See also
- getCountDigit
Example usage ⛓
10 integer(IKD),
allocatable :: IntList(:)
13 type(display_type) :: disp
17 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
18 call disp%show(
"! Compute the number of digits in a given integer.")
19 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
23 call disp%show(
"getCountDigit(5_IKS)")
28 call disp%show(
"getCountDigit(5_IKD)")
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)])")
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)])")
47 call disp%show(
"IntList = [(2_IKD**i, i = 0, 63, 16)]")
48 IntList
= [(
2_IKD**i, i
= 0,
63,
16)]
51 call disp%show(
"getCountDigit(IntList)")
This is a generic method of the derived type display_type with pass attribute.
This is a generic method of the derived type display_type with pass attribute.
This module contains classes and procedures for input/output (IO) or generic display operations on st...
type(display_type) disp
This is a scalar module variable an object of type display_type for general display.
integer, parameter IKS
The single-precision integer kind in Fortran mode. On most platforms, this is a 32-bit integer kind.
integer, parameter IKD
The double precision integer kind in Fortran mode. On most platforms, this is a 64-bit integer kind.
integer, parameter SK
The default character kind in the ParaMonte library: kind("a") in Fortran, c_char in C-Fortran Intero...
Generate and return an object of type display_type.
Example Unix compile command via Intel ifort
compiler ⛓
3ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
Example Windows Batch compile command via Intel ifort
compiler ⛓
2set PATH=..\..\..\lib;%PATH%
3ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
Example Unix / MinGW compile command via GNU gfortran
compiler ⛓
3gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
Example output ⛓
15[
-huge(
0_IKS),
huge(
0_IKS)]
16-2147483647,
+2147483647
21[
-huge(
0_IKD),
huge(
0_IKD)]
22-9223372036854775807,
+9223372036854775807
27IntList
= [(
2_IKD**i, i
= 0,
63,
16)]
29+1,
+65536,
+4294967296,
+281474976710656
- 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.
-
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.
-
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.