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mathlib: Fixed todo 3/2=1

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This commit is contained in:
Daniel Marjamäki 2009-04-16 22:06:17 +02:00
parent 23f00e64cb
commit 7cddc52d8f
3 changed files with 109 additions and 62 deletions
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62
src/mathlib.cpp
View File

@ -30,64 +30,104 @@
#include <cstdlib>
#include <cmath>
double MathLib::toNumber(const std::string &str)
long MathLib::toLongNumber(const std::string &str)
{
if (strncmp(str.c_str(), "0x", 2) == 0)
{
return strtoul(str.c_str(), '\0', 16);
}
if (strncmp(str.c_str(), "0", 1) == 0)
{
return strtoul(str.c_str(), '\0', 8);
}
return atol(str.c_str());
}
double MathLib::toDoubleNumber(const std::string &str)
{
return atof(str.c_str());
}
std::string MathLib::toString(double d)
template <typename T>
std::string MathLib::toString(T d)
{
std::ostringstream result;
result << d;
return result.str();
}
bool MathLib::isInt(const std::string & str)
{
if (str.find(".", 0) != std::string::npos || str.find("e", 0) != std::string::npos
|| str.find("E", 0) != std::string::npos)
{
return false;
}
return true;
}
std::string MathLib::add(const std::string & first, const std::string & second)
{
return toString(toNumber(first) + toNumber(second));
if (MathLib::isInt(first) && MathLib::isInt(second))
{
return toString<long>(toLongNumber(first) + toLongNumber(second));
}
return toString<double>(toDoubleNumber(first) + toDoubleNumber(second));
}
std::string MathLib::subtract(const std::string &first, const std::string &second)
{
return toString(toNumber(first) - toNumber(second));
if (MathLib::isInt(first) && MathLib::isInt(second))
{
return toString<long>(toLongNumber(first) - toLongNumber(second));
}
return toString<double>(toDoubleNumber(first) - toDoubleNumber(second));
}
std::string MathLib::divide(const std::string &first, const std::string &second)
{
return toString(toNumber(first) / toNumber(second));
if (MathLib::isInt(first) && MathLib::isInt(second))
{
return toString<long>(toLongNumber(first) / toLongNumber(second));
}
return toString<double>(toDoubleNumber(first) / toDoubleNumber(second));
}
std::string MathLib::multiply(const std::string &first, const std::string &second)
{
return toString(toNumber(first) * toNumber(second));
if (MathLib::isInt(first) && MathLib::isInt(second))
{
return toString<long>(toLongNumber(first) * toLongNumber(second));
}
return toString<double>(toDoubleNumber(first) * toDoubleNumber(second));
}
std::string MathLib::sin(const std::string &tok)
{
return toString(::sin(toNumber(tok)));
return toString<double>(::sin(toDoubleNumber(tok)));
}
std::string MathLib::cos(const std::string &tok)
{
return toString(::cos(toNumber(tok)));
return toString<double>(::cos(toDoubleNumber(tok)));
}
std::string MathLib::tan(const std::string &tok)
{
return toString(::tan(toNumber(tok)));
return toString<double>(::tan(toDoubleNumber(tok)));
}
std::string MathLib::abs(const std::string &tok)
{
return toString(::abs(toNumber(tok)));
return toString<double>(::abs(toDoubleNumber(tok)));
}
bool MathLib::isGreater(const std::string &first, const std::string &second)
{
return toNumber(first) > toNumber(second);
return toDoubleNumber(first) > toDoubleNumber(second);
}

9
src/mathlib.h
View File

@ -26,8 +26,13 @@
class MathLib
{
private:
static double toNumber(const std::string & str);
static std::string toString(double d);
static long toLongNumber(const std::string & str);
static double toDoubleNumber(const std::string & str);
template<typename T>
static std::string toString(T d);
static bool isInt(const std::string & str);
public:
static std::string add(const std::string & first, const std::string & second);
static std::string subtract(const std::string & first, const std::string & second);

6
test/testmathlib.cpp
View File

@ -38,9 +38,11 @@ private:
void calculate()
{
ASSERT_EQUALS(std::string("256"), MathLib::add("0xff", "1"));
ASSERT_EQUALS(std::string("0.003"), MathLib::multiply("1e-3", "3"));
ASSERT_EQUALS(std::string("-0.003"), MathLib::multiply("-1e-3", "3"));
ASSERT_EQUALS(std::string("5"), MathLib::divide("25.5", "5.1"));
TODO_ASSERT_EQUALS(std::string("1"), MathLib::divide("3", "2"));
ASSERT_EQUALS(std::string("-11.96"), MathLib::multiply("-2.3", "5.2"));
ASSERT_EQUALS(std::string("7"), MathLib::divide("21.", "3"));
ASSERT_EQUALS(std::string("1"), MathLib::divide("3", "2"));
}
};