How to install : gfortran.exe in codeblocks  20.03 of above.
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info:peter.vlasschaert@gmail.com,12/07/2022

windows 10 ( people : windows 11 check : problems > youtube)

0e)first : read > 6e)

1e) Download : Codeblocks + MinGw (x64 architecture)

https://www.codeblocks.org/
http://www.codeblocks.org/downloads/source/
page : below (picture)

Binary releases > Microsoft windows

codeblocks-20.03mingw-setup.exe 	FossHUB or Sourceforge.net

2e) Excute selected download (directory structure)

program :

path : C:\Program Files\CodeBlocks

compilers ( later needit : gfortran.exe ,bin :subdirectory) :

path : C:\Program Files\CodeBlocks\MinGW
path : C:\Program Files\CodeBlocks\MinGW\bin\gfortran.exe

3e) How can windows find the path to : MinGW.

type here to search :environ
result :edit the system environment variables, click it.
window : system properties
click on : Environment Variables
new windows open : User variables for "computername"
scroll down . see path (select with the mouse) ,BUTTON :edit
click : Button : New
copy : C:\Program Files\CodeBlocks\MinGW\bin
click : Ok
click : Ok
result :Envirnment Variables ,window > close.
click : Ok
result :System Properties    ,window > close

4e) check : everything  c-compiler ( by default)
Type here to search :cmd     
result : c:\Users\science>gcc --version
some text :MinGW

5e) How find codeblocks > gfortran.exe

a) run codeblocks
b) Menu : settings > Compiler
result : window opens : Global compiler settings
   c1) selected compiler : dropdown menu 
       GNU Fortran Compiler
       click : Set as Default
   c2) Compiler settings ,Linker settings,Search directories,Toolchains executables,........
       click : Toolchains executables
   Compiler's installation directory:
   C:\Program Files\CodeBlocks\MinGW
   Program Files > C   compiler (inside) : gfortran.exe
                   C++ compiler (inside) : gfortran.exe
                   Linnkerfordynamic libs: gfortran.exe
   c3) click Ok : now you can use (gfortran.exe),close : code blocks
   c4) restart : code blocks > programming fortran.

6e) take : paper "set back to gcc compiler",everything you 
    change:inside codeblocks.