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Throw an InternalError when trying to divide (or modulo) by zero in MathLib.

This commit is contained in:
PKEuS 2012-09-06 20:15:32 +02:00
parent 20f989b6c4
commit 0c812c5ac3
2 changed files with 14 additions and 4 deletions
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10
lib/mathlib.cpp
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@ -235,7 +235,10 @@ std::string MathLib::subtract(const std::string &first, const std::string &secon
std::string MathLib::divide(const std::string &first, const std::string &second)
{
if (MathLib::isInt(first) && MathLib::isInt(second)) {
return toString<bigint>(toLongNumber(first) / toLongNumber(second));
bigint b = toLongNumber(second);
if (b == 0)
throw InternalError(0, "Internal Error: Division by zero");
return toString<bigint>(toLongNumber(first) / b);
}
return toString<double>(toDoubleNumber(first) / toDoubleNumber(second));
}
@ -251,7 +254,10 @@ std::string MathLib::multiply(const std::string &first, const std::string &secon
std::string MathLib::mod(const std::string &first, const std::string &second)
{
if (MathLib::isInt(first) && MathLib::isInt(second)) {
return toString<MathLib::bigint>(toLongNumber(first) % toLongNumber(second));
bigint b = toLongNumber(second);
if (b == 0)
throw InternalError(0, "Internal Error: Division by zero");
return toString<MathLib::bigint>(toLongNumber(first) % b);
}
return toString<double>(fmod(toDoubleNumber(first),toDoubleNumber(second)));
}

6
test/testmathlib.cpp
View File

@ -100,6 +100,7 @@ private:
ASSERT_EQUALS("0" , MathLib::subtract("0", "0."));
ASSERT_EQUALS("0.99999999" , MathLib::subtract("1", "0.00000001")); // #4016
ASSERT_EQUALS("30666.22" , MathLib::subtract("30666.22", "0.0")); // #4068
ASSERT_EQUALS("0.0" , MathLib::subtract("0.0", "0.0"));
// multiply
ASSERT_EQUALS("-0.003" , MathLib::multiply("-1e-3", "3"));
@ -123,7 +124,8 @@ private:
ASSERT_EQUALS("5" , MathLib::divide("25.5", "5.1"));
ASSERT_EQUALS("7" , MathLib::divide("21.", "3"));
ASSERT_EQUALS("1" , MathLib::divide("3", "2"));
ASSERT_EQUALS("0.0" , MathLib::subtract("0.0", "0.0"));
ASSERT_THROW(MathLib::divide("123", "0"), InternalError); // throw
MathLib::divide("123", "0.0"); // don't throw
// Unknown action should throw exception
ASSERT_THROW(MathLib::calculate("1","2",'j'),InternalError);
@ -137,6 +139,8 @@ private:
ASSERT_EQUALS("12" , MathLib::calculate("12.0" , "13.0" , '%'));
ASSERT_EQUALS("1.3" , MathLib::calculate("5.3" , "2.0" , '%'));
ASSERT_EQUALS("1.7" , MathLib::calculate("18.5" , "4.2" , '%'));
ASSERT_THROW(MathLib::calculate("123", "0", '%'), InternalError); // throw
MathLib::calculate("123", "0.0", '%'); // don't throw
}
void convert() const {