85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
#include "pch.h"
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#include "NumberFormattingUtils.h"
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using namespace std;
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namespace CalcManager::NumberFormattingUtils
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{
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/// <summary>
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/// Trims out any trailing zeros or decimals in the given input string
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/// </summary>
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/// <param name="number">number to trim</param>
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void TrimTrailingZeros(_Inout_ wstring& number)
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{
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if (number.find(L'.') == wstring::npos)
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{
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return;
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}
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wstring::iterator iter;
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for (iter = number.end() - 1;; iter--)
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{
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if (*iter != L'0')
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{
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number.erase(iter + 1, number.end());
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break;
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}
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}
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if (*(number.end() - 1) == L'.')
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{
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number.erase(number.end() - 1, number.end());
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}
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}
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/// <summary>
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/// Get number of digits (whole number part + decimal part)</summary>
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/// <param name="value">the number</param>
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unsigned int GetNumberDigits(wstring value)
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{
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TrimTrailingZeros(value);
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unsigned int numberSignificantDigits = static_cast<unsigned int>(value.size());
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if (value.find(L'.') != wstring::npos)
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{
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--numberSignificantDigits;
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}
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if (value.find(L'-') != wstring::npos)
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{
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--numberSignificantDigits;
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}
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return numberSignificantDigits;
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}
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/// <summary>
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/// Get number of digits (whole number part only)</summary>
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/// <param name="value">the number</param>
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unsigned int GetNumberDigitsWholeNumberPart(double value)
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{
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return value == 0 ? 1 : (1 + (int)log10(abs(value)));
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}
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/// <summary>
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/// Rounds the given double to the given number of significant digits
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/// </summary>
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/// <param name="num">input double</param>
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/// <param name="numSignificant">int number of significant digits to round to</param>
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wstring RoundSignificantDigits(double num, int numSignificant)
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{
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wstringstream out(wstringstream::out);
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out << fixed;
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out.precision(numSignificant);
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out << num;
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return out.str();
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}
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/// <summary>
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/// Convert a Number to Scientific Notation
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/// </summary>
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/// <param name="number">number to convert</param>
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wstring ToScientificNumber(double number)
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{
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wstringstream out(wstringstream::out);
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out << scientific << number;
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return out.str();
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}
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}
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