/// <summary>
/// Evaluates the Expression
/// </summary>
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
int leftOp = mExp1.Eval(tbl, heap);
int rightOp = mExp2.Eval(tbl, heap);
switch (mOp)
{
case "+":
return(leftOp + rightOp);
case "-":
return(leftOp - rightOp);
case "*":
return(leftOp * rightOp);
case "/":
if (rightOp == 0)
{
throw new MyDivisionByZeroException("Division by zero");
}
else
{
return(leftOp / rightOp);
}
default:
return(0);
}
}
public PrgState(MyIStack<T> stk, MyIDictionary symtbl, MyIList ot, MyIHeap heap, int id)
{
exeStack = stk;
@out = ot;
symTable = symtbl;
mHeap = heap;
mId = id;
}
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
GetIntInput inp = new GetIntInput();
inp.ShowDialog();
return(Int32.Parse(inp.GetText()));
}
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
int heapAddr = tbl.Lookup(mVarName);
try
{
heap.ContainsKey(heapAddr);
}
catch (ArgumentNullException npe)
{
throw new MyNullPointerException("Heap memory location unallocated");
}
return(heap.Get(heapAddr));
}
public PrgState <T> Execute <T>(PrgState <T> state)
{
MyIHeap heap = state.GetHeap();
MyIDictionary symTable = state.GetSymTable();
if (symTable.IsDefined(mVarName))
{
heap.Update(symTable.Lookup(mVarName), mExp.Eval(symTable, heap));;
}
else
{
throw new ArgumentException("Heap address undefined");
}
return(null);
}
public PrgState <T> Execute <T>(PrgState <T> state)
{
MyIHeap heap = state.GetHeap();
MyIDictionary symTable = state.GetSymTable();
if (symTable.IsDefined(mVarName))
{
symTable.Update(mVarName, heap.Size() + 1);
heap.Put(heap.Size() + 1, mExp.Eval(symTable, heap));
}
else
{
symTable.Add(mVarName, heap.Size() + 1);
heap.Put(heap.Size() + 1, mExp.Eval(symTable, heap));
}
return(null);
}
//Evaluates the exp
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
return(tbl.Lookup(mId));
}
/**
* Evaluates the expression
* Return :
* 1 - true
* 0 - false
* @throws DataTypesException
*/
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
int rightOp = 0;
int leftOp = mExp1.Eval(tbl, heap);
if (mExp2 != null)
{
rightOp = mExp2.Eval(tbl, heap);
}
switch (mOp)
{
case "==":
if (leftOp == rightOp)
{
return(1);
}
else
{
return(0);
}
case "!=":
if (leftOp != rightOp)
{
return(1);
}
else
{
return(0);
}
case "<":
if (leftOp < rightOp)
{
return(1);
}
else
{
return(0);
}
case "<=":
if (leftOp <= rightOp)
{
return(1);
}
else
{
return(0);
}
case ">":
if (leftOp > rightOp)
{
return(1);
}
else
{
return(0);
}
case ">=":
if (leftOp >= rightOp)
{
return(1);
}
else
{
return(0);
}
case "&&":
if (leftOp != 0 && rightOp != 0)
{
return(1);
}
else
{
return(0);
}
case "||":
if (leftOp != 0 || rightOp != 0)
{
return(1);
}
else
{
return(0);
}
case "!":
if (leftOp == 0)
{
return(0);
}
else
{
return(1);
}
default:
return(0);
}
}
// Evaluates the exp
public override int Eval(MyIDictionary tbl, MyIHeap heap)
{
return(mNumber);
}
public void SetHeap(MyIHeap heap)
{
mHeap = heap;
}
//Evaluates the Exp public abstract int Eval(MyIDictionary tbl, MyIHeap heap);
