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+Location: https://www.osti.gov/biblio/1649607 [following]
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diff --git a/example0/hello b/example0/hello
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diff --git a/example0/hello.cpp b/example0/hello.cpp
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+#include <iostream>
+
+extern "C" {
+    void add_number(float x, float y, float* sum);
+}
+
+int main() {
+    float a = 5.0;
+    float b = 10.0;
+    float result;
+    add_number(a, b, &result);
+    std::cout << "the sum of the numbers is " << result << std::endl;
+    return 0;
+}
diff --git a/example0/hello.f90 b/example0/hello.f90
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+program main
+  use math_module
+  implicit none
+  real :: a, b, result
+
+  a = 5.0
+  b = 10.0
+
+  call add_number(a, b, result)
+
+  print *, "the sum of the number is : ", result
+
+end program main
diff --git a/example0/hello.o b/example0/hello.o
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diff --git a/example0/math_module.f90 b/example0/math_module.f90
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+module math_module
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+contains
+
+  subroutine add_number(x, y, sum) bind(C, name="add_number")
+    implicit none
+    real(c_float), intent(in), value :: x, y
+    real(c_float), intent(out) :: sum
+    sum = x + y
+  end subroutine add_number
+
+end module math_module
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diff --git a/example0/math_module.so b/example0/math_module.so
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