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Add support for Fortran D-notation in scientific input (Fixes #2403) #2414

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Add support for Fortran D-notation in scientific input (Fixes #2403) #2414

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Add support for Fortran D-exponent notation
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@Amitjoiya
Amitjoiya committed Nov 28, 2025
commit 3709938d04adfd19ead719198efe710579048147
2 changes: 1 addition & 1 deletion src/CalcManager/CEngine/scidisp.cpp
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Expand Up @@ -23,7 +23,7 @@ using namespace CalcEngine;
constexpr int MAX_EXPONENT = 4;
constexpr uint32_t MAX_GROUPING_SIZE = 16;
constexpr wstring_view c_decPreSepStr = L"[+-]?(\\d*)[";
constexpr wstring_view c_decPostSepStr = L"]?(\\d*)(?:e[+-]?(\\d*))?$";
constexpr wstring_view c_decPostSepStr = L"]?(\\d*)(?:[eEdD][+-]?(\\d*))?$";

/****************************************************************************\
* void DisplayNum(void)
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29 changes: 29 additions & 0 deletions src/CalculatorUnitTests/CalcEngineTests.cpp
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Expand Up @@ -5,6 +5,7 @@
#include <CppUnitTest.h>

#include "CalcViewModel/Common/EngineResourceProvider.h"
#include "ratpak.h"

using namespace std;
using namespace CalculatorApp;
Expand Down Expand Up @@ -235,6 +236,34 @@ namespace CalculatorEngineTests
L"Verify expanded form multigroup non-repeating grouping.");
}

TEST_METHOD(TestFortranDNotationParsing)
{
// Parse a Fortran-style D exponent and verify numeric value
PNUMBER pnum = StringToNumber(L"1.073092093321713D-002", 10, 17);
VERIFY_IS_NOT_NULL(pnum);
std::wstring s = NumberToString(pnum, NumberFormat::Float, 10, 17);
double actual = std::stod(s);
double expected = 1.073092093321713e-2;
Assert::AreEqual(expected, actual, 1e-15, L"D-notation should parse to correct numeric value");
destroynum(pnum);

// Verify equivalence with E-notation
PNUMBER pnumE = StringToNumber(L"1.073092093321713E-002", 10, 17);
VERIFY_IS_NOT_NULL(pnumE);
std::wstring sE = NumberToString(pnumE, NumberFormat::Float, 10, 17);
double actualE = std::stod(sE);
Assert::AreEqual(expected, actualE, 1e-15, L"E-notation should parse to same numeric value");
destroynum(pnumE);

// Also test compact form like 5D5
PNUMBER pnum2 = StringToNumber(L"5D5", 10, 17);
VERIFY_IS_NOT_NULL(pnum2);
std::wstring s2 = NumberToString(pnum2, NumberFormat::Float, 10, 17);
double actual2 = std::stod(s2);
Assert::AreEqual(5e5, actual2, 1e-9, L"5D5 should parse as 5e5");
destroynum(pnum2);
}

private:
unique_ptr<CCalcEngine> m_calcEngine;
shared_ptr<IResourceProvider> m_resourceProvider;
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