diff --git a/language_learning/2023.07.19_include_and_use_in_fortran/example.f90 b/language_learning/2023.07.19_include_and_use_in_fortran/example.f90
new file mode 100644
index 0000000..d8495eb
--- /dev/null
+++ b/language_learning/2023.07.19_include_and_use_in_fortran/example.f90
@@ -0,0 +1,59 @@
+ !this code is supported by the website: https://www.guanjihuan.com
+ !the newest version of this code is on the web page: https://www.guanjihuan.com/archives/34966
+
+
+module module_1
+
+  implicit none
+  contains  ! 模块中包含以下子程序和函数
+
+  subroutine subroutine_1()  ! 模块中的子程序
+    write(*,*) 'test_1'
+  end subroutine subroutine_1
+
+  function function_1(x) result(y) ! 模块中的函数
+  double precision x, y
+    y = 2.d0*x
+  end function function_1
+  
+end module module_1
+
+
+include 'example_include_1.f90'
+
+
+program main
+
+use module_1
+use module_2
+
+implicit none
+double precision x, function_3, function_4
+x = 1.d0
+
+call subroutine_1()
+write(*,*) function_1(x)
+
+call subroutine_2()
+write(*,*) function_2(x)
+
+call subroutine_3()
+write(*,*) function_3(x)
+
+call subroutine_4()
+write(*,*) function_4(x)
+
+end program main
+
+
+subroutine subroutine_3()
+write(*,*) 'test_3'
+end subroutine subroutine_3
+
+
+function function_3(x) result(y) ! 模块中的函数
+double precision x, y
+y = 8.d0*x
+end function function_3
+
+include 'example_include_2.f90'
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diff --git a/language_learning/2023.07.19_include_and_use_in_fortran/example_include_1.f90 b/language_learning/2023.07.19_include_and_use_in_fortran/example_include_1.f90
new file mode 100644
index 0000000..ea2b2ab
--- /dev/null
+++ b/language_learning/2023.07.19_include_and_use_in_fortran/example_include_1.f90
@@ -0,0 +1,15 @@
+module module_2
+
+      implicit none
+      contains  ! 模块中包含以下子程序和函数
+    
+      subroutine subroutine_2()  ! 模块中的子程序
+         write(*,*) 'test_2'
+      end subroutine subroutine_2
+
+      function function_2(x) result(y) ! 模块中的函数
+          double precision x, y
+            y = 4.d0*x
+      end function function_2
+      
+end module module_2
\ No newline at end of file
diff --git a/language_learning/2023.07.19_include_and_use_in_fortran/example_include_2.f90 b/language_learning/2023.07.19_include_and_use_in_fortran/example_include_2.f90
new file mode 100644
index 0000000..2fc1bd0
--- /dev/null
+++ b/language_learning/2023.07.19_include_and_use_in_fortran/example_include_2.f90
@@ -0,0 +1,9 @@
+subroutine subroutine_4()
+    write(*,*) 'test_4'
+end subroutine subroutine_4
+
+
+function function_4(x) result(y)
+    double precision x, y
+    y = 16.d0*x
+end function function_4
\ No newline at end of file