Fortran2Cpp dataset questions

[chunhualiao]

a set of dialogues: id values: 1 to 2529

• Each dialogue has several rounds of user-assistant (instruction-response) pairs.

One example dialogue

Round1 : Translate Fortran code into C++

• user: "Could you please translate the following Fortran code into C++?\n\nfortran\nmodule m\n integer::i=3\n integer::j=4\nend module m\n\nprogram t\n use m,only:i\n integer::j=77\n print '(i0)',i,j\nend program t\n"
• assistant: "Certainly! Below is the translation of the provided Fortran code into C++. Given the differences in how modules and global variables are handled between Fortran and C++, we'll use a combination of a namespace (to somewhat mimic the Fortran module) and global variables for the translation:\n\ncpp\n#include <iostream>\n\n// Mimicking the Fortran module 'm' with a namespace\nnamespace m {\n int i = 3; // equivalent to \"integer::i=3\" in Fortran\n // 'j' is not included here since it's not used in the 't' program directly from 'm'\n}\n\nint main() {\n using namespace m; // Using the variables from namespace m, similar to 'use m,only:i'\n int j = 77; // equivalent to \"integer::j=77\" in Fortran\n\n // Printing values of 'i' and 'j', similar to Fortran's print statement\n std::cout << i << \" \" << j << std::endl;\n\n return 0;\n}\n\n\nNote that in C++, we typically use namespaces to group related variables and functions, somewhat similar to Fortran modules. However, C++ namespaces and Fortran modules are not directly equivalent; Fortran modules can also contain module procedures and provide a mechanism for data encapsulation and interface definition, which is more akin to classes in C++. For simplicity and given the context of the provided code, we've used a namespace for a direct translation.\n\nAlso, since Fortran's use statement for modules allows for selective import of symbols with the only: clause, we've simulated this by only bringing the namespace m into scope with using namespace m; and then defining j locally, since j is not meant to be imported from m in the original Fortran code."

Round 2: Provide Unit testing for both Fortran and translated C++ (this prompt may be too complex, better divide into two?)

• user: "Could you please provide executable Unit tests for both the original Fortran code and the translated C++ code to verify their correctness?"
• assistant: "Certainly! To verify the correctness of both the original Fortran code and its translated C++ counterpart, we can write simple unit tests. Since Fortran and C++ have different standard practices for unit testing, the examples below are tailored to each language's ecosystem.\n\n### Fortran Unit Test\n\nFor Fortran, there isn't a standard testing framework like there is in some other languages. However, for our simple example, we can write a basic test by invoking the program and checking its output. Note that more complex Fortran projects might benefit from using a specialized testing framework or library.\n\nGiven the simplicity of the provided Fortran code, a \"unit test\" might just involve compiling the program and checking its output manually. Automated approaches could involve scripts but are beyond the scope of this simple example.\n\nManual Test Procedure:\n\n1. Compile the Fortran program.\n2. Run the compiled executable.\n3. Verify that the output matches the expected values of i and j.\n\nAssuming the Fortran program is saved as test.f90, you can compile and run it as follows (using gfortran as the Fortran compiler):\n\nsh\ngfortran test.f90 -o test\n./test\n\n\nExpected output:\n\n3 77\n\n\n### C++ Unit Test\n\nFor C++, we have several frameworks at our disposal. One of the most popular is Google Test. Below is an example of how to write a simple test for the translated C++ code using Google Test.\n\nStep 1: Install Google Test. Depending on your system, the installation steps may vary. On some systems, you can install it via package managers.\n\nStep 2: Write the C++ program and a test case.\n\nmain.cpp:\n\ncpp\n#include <iostream>\n\nnamespace m {\n int i = 3;\n}\n\nint main() {\n using namespace m;\n int j = 77;\n\n std::cout << i << \" \" << j << std::endl;\n\n return 0;\n}\n\n\ntest.cpp:\n\ncpp\n#include <gtest/gtest.h>\n#include <sstream> // For std::stringstream\n#include <iostream>\n\nnamespace m {\n extern int i; // Declaration, since i is defined in main.cpp\n}\n\n// A mock of main() to test its output\nstd::string testMainOutput() {\n using namespace m;\n int j = 77;\n\n std::stringstream buffer;\n // Save the old buffer\n auto old = std::cout.rdbuf(buffer.rdbuf());\n\n // Code under test\n std::cout << i << \" \" << j;\n \n // Restore the original buffer\n std::cout.rdbuf(old);\n\n return buffer.str();\n}\n\nTEST(MainOutputTest, MainPrintsCorrectValues) {\n EXPECT_EQ(testMainOutput(), \"3 77\");\n}\n\nint main(int argc, char **argv) {\n ::testing::InitGoogleTest(&argc, argv);\n return RUN_ALL_TESTS();\n}\n\n\nStep 3: Compile and run the test.\n\nTo compile and run the test, you need to link against the Google Test library. The exact command depends on your setup, but it might look something like this:\n\nsh\ng++ -std=c++11 main.cpp test.cpp -lgtest -lgtest_main -pthread -o test_exe\n./test_exe\n\n\nThis command compiles both main.cpp and test.cpp into an executable named test_exe, linking against Google Test (-lgtest and -lgtest_main) and enabling threading support (-pthread). When you run ./test_exe, Google Test will execute the MainOutputTest.MainPrintsCorrectValues test, which checks if the output of the modified main (mocked in testMainOutput()) matches the expected output \"3 77\".\n\nThese examples provide a basic framework for testing the given Fortran and C++ codes. For more complex scenarios or real-world applications, you may need more sophisticated testing strategies and tools."

Round 3: What does this step do?? You may need to explain to LLMs what the error message is about and how it is generated.

• user: "\nI need you to help me put all the functions I need into the same fortran file instead of adding additional header files.\nFortran Compile Stderr:b\"/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o: in function _start':\\n(.text+0x24): undefined reference tomain'\ncollect2: error: ld returned 1 exit status\n\"\n"
• assistant: "Certainly! Integrating a basic unit test directly into the Fortran file without relying on external frameworks or additional files requires a slightly unconventional approach, but it can be done for simple tests. We'll modify the original Fortran program to include a \"test\" section that validates the functionality directly within the source code. \n\nSince Fortran does not have a built-in unit testing framework like some other languages, we'll implement a simple check for the output. Note that this approach is more of a manual test and lacks the robustness and features of a true unit testing framework. The emphasis here is on simplicity and keeping everything in a single file.\n\nHere's how you could structure your Fortran code with an included basic \"test\" for the functionality related to the original example:\n\nfortran\nmodule m\n integer :: i = 3\n integer :: j = 4\nend module m\n\n! A subroutine for testing\nsubroutine test_i_j()\n use m, only: i\n integer :: j\n j = 77\n\n if (i == 3 .and. j == 77) then\n print *, \"Test passed: i and j have expected values.\"\n else\n print *, \"Test failed: Unexpected values for i or j.\"\n end if\nend subroutine test_i_j\n\nprogram t\n use m, only: i\n integer :: j\n j = 77\n print '(i0,1x,i0)', i, j\n\n ! Call the test subroutine\n call test_i_j()\nend program t\n\n\nIn this modified version of your Fortran program, I've added a subroutine called test_i_j that performs a simple check: it verifies that the values of i and j are as expected based on the original program's logic. If the values are as expected, it prints \"Test passed\"; otherwise, it prints \"Test failed\".\n\nThe test is called at the end of the program t, after the original print statement. This way, the program will execute as before but now will also include a basic test of its functionality.\n\nThis approach is quite basic and manual but allows for testing within a single Fortran file without external dependencies. For more complex programs or more comprehensive testing, consider adopting a Fortran testing framework or external tools designed for that purpose."

Round 4: why do you need to ask LLMs to check unit test results? Unit test results directly provide the answer already.,

• user: "\nfortran code outputs: Fortran Stdout: 3 77\n Test passed: i and j have expected values.\n\nFortran Stderr: \nC++ code result: C++ Stdout: 3 77\n\nC++ Stderr: \nBased on the unit test results tell me if the translation has been done correctly?\nJust Answer \"Yes\" or \"No\".\n"
• assistant: Yes

Round 5: create the fortran-C++ code pair

• user: "\nGive the the correct and complete fortran-c++ code pair based on your last unit test codes.\n"
• assistant: "Based on the request and the confirmation that the translation was done correctly, here are the complete Fortran and C++ code pairs, including the basic \"unit test\" we discussed for the Fortran code.\n\n### Fortran Code with Basic Test\n\nfortran\nmodule m\n integer :: i = 3\n integer :: j = 4\nend module m\n\nsubroutine test_i_j()\n use m, only: i\n integer :: j\n j = 77\n\n if (i == 3 .and. j == 77) then\n print *, \"Test passed: i and j have expected values.\"\n else\n print *, \"Test failed: Unexpected values for i or j.\"\n end if\nend subroutine test_i_j\n\nprogram t\n use m, only: i\n integer :: j\n j = 77\n print '(i0,1x,i0)', i, j\n\n ! Call the test subroutine\n call test_i_j()\nend program t\n\n\n### C++ Code with Unit Test Using Google Test\n\nmain.cpp\n\ncpp\n#include <iostream>\n\nnamespace m {\n int i = 3;\n // Note: `j` is not needed globally in this translation; it's defined locally in main and the test.\n}\n\nint main() {\n using namespace m;\n int j = 77;\n\n std::cout << i << \" \" << j << std::endl;\n\n return 0;\n}\n\n\ntest.cpp (For Google Test Framework)\n\ncpp\n#include <gtest/gtest.h>\n#include <sstream>\n#include <iostream>\n\nnamespace m {\n extern int i; // Declaration, since i is defined in main.cpp\n}\n\n// A mock function to test the output of the \"main\" functionality\nstd::string testMainOutput() {\n using namespace m;\n int j = 77;\n\n std::stringstream buffer;\n // Save cout's current buffer\n auto* old = std::cout.rdbuf(buffer.rdbuf());\n\n // Code block to test\n std::cout << i << \" \" << j;\n\n // Restore cout's original buffer\n std::cout.rdbuf(old);\n\n return buffer.str();\n}\n\nTEST(MainOutputTest, MainPrintsCorrectValues) {\n EXPECT_EQ(\"3 77\\n\", testMainOutput());\n}\n\nint main(int argc, char **argv) {\n ::testing::InitGoogleTest(&argc, argv);\n return RUN_ALL_TESTS();\n}\n\n\nTo compile and run the C++ tests, assuming you have Google Test installed and configured correctly, you might use a command similar to:\nsh\ng++ -std=c++11 main.cpp test.cpp -lgtest -lgtest_main -pthread -o test_exe && ./test_exe\n\n\nThis complete code pair reflects the original request, with a simple \"unit test\" included in the Fortran code to check the values of i and j, and a C++ unit test using Google Test to validate the output of the translated C++ code."

I guess you store the final pairs extracted from the dialogues into some dataset somewhere.

Where to find them?

[bin123apple]

Just uploaded the dataset, it is in data/F2C_dialogue_25K.json file.

[chunhualiao]

Please explain the format of our dataset to be released to the community: write in paper

• is it a sequence of dialogue?
• or pairs of Fortran vs. C++ code?

Please justify your choice,

How do you expect users to extract traditional code Paris from your dialogue?

[bin123apple]

It is a sequence of dialogue.

[chunhualiao]

The dataset eventually should be released on huggingFace with sufficient documentation .

• Does huggingFace support private datasets for internal reviewing? If so, please upload the dataset and docs there and ask for review