/////////////////////////////////////////////////////////////////////////////////////
public bool Visit(VCExprLiteral node, LineariserOptions options)
{
if (node == VCExpressionGenerator.True)
{
wr.Write("true");
}
else if (node == VCExpressionGenerator.False)
{
wr.Write("false");
}
else if (node is VCExprIntLit)
{
BigNum lit = ((VCExprIntLit)node).Val;
if (lit.IsNegative)
{
// In SMT2 "-42" is an identifier (SMT2, Sect. 3.2 "Symbols")
wr.Write("(- 0 {0})", lit.Abs);
}
else
{
wr.Write(lit);
}
}
else if (node is VCExprRealLit)
{
BigDec lit = ((VCExprRealLit)node).Val;
if (lit.IsNegative)
{
// In SMT2 "-42" is an identifier (SMT2, Sect. 3.2 "Symbols")
wr.Write("(- 0.0 {0})", lit.Abs.ToDecimalString());
}
else
{
wr.Write(lit.ToDecimalString());
}
}
else if (node is VCExprFloatLit)
{
BigFloat lit = ((VCExprFloatLit)node).Val;
wr.Write("(" + lit.ToBVString() + ")");
}
else if (node is VCExprRModeLit)
{
RoundingMode lit = ((VCExprRModeLit)node).Val;
wr.Write(lit.ToString());
}
else if (node is VCExprStringLit)
{
String lit = ((VCExprStringLit)node).Val;
wr.Write("\"" + lit.ToString() + "\"");
}
else
{
Contract.Assert(false);
throw new cce.UnreachableException();
}
return(true);
}
public override string ToString()
{
return(string.Format(_FCS, "Precision = {0} RoundingMode = {1}", Precision, RoundingMode.ToString()));
}
public static decimal Round(this decimal value, int decimalPlaces, RoundingMode mode)
{
//http://en.wikipedia.org/wiki/Rounding
int factor = decimalPlaces.PowerOfTen();
if (mode == RoundingMode.RoundCeiling)
{
if (value >= 0)
{
return(RoundUp(value, factor));
}
else
{
return(RoundDown(value, factor));
}
}
else if (mode == RoundingMode.RoundFloor)
{
if (value >= 0)
{
return(RoundDown(value, factor));
}
else
{
return(RoundUp(value, factor));
}
}
else if (mode == RoundingMode.RoundUp)
{
return(RoundUp(value, factor));
}
else if (mode == RoundingMode.RoundDown)
{
return(RoundDown(value, factor));
}
decimal absolute = value.Abs() * factor;
decimal discardedFraction = absolute.FractionaryPart();
if (mode == RoundingMode.RoundHalfUp)
{
if (discardedFraction >= 0.5M)
{
return(RoundUp(value, factor));
}
else
{
return(RoundDown(value, factor));
}
}
else if (mode == RoundingMode.RoundHalfDown)
{
if (discardedFraction > 0.5M)
{
return(RoundUp(value, factor));
}
else
{
return(RoundDown(value, factor));
}
}
else if (mode == RoundingMode.RoundHalfEven)
{
return(Round(value, decimalPlaces, Decimal.Floor(absolute) % 2 == 0 ? RoundingMode.RoundHalfDown : RoundingMode.RoundHalfUp));
}
else if (mode == RoundingMode.RoundHalfOdd)
{
return(Round(value, decimalPlaces, Decimal.Floor(absolute) % 2 != 0 ? RoundingMode.RoundHalfDown : RoundingMode.RoundHalfUp));
}
throw new ArgumentException("Rounding type " + mode.ToString() + " is not recognized");
}
