int DataBuffer::pop(DataType &data) {
data.second = NULL;
data.first = 0;
if (isFinished()) return STOP;
if (!canPop()) return EMPTY;
data = buffer.front();
buffer.pop();
//cci::common::Debug::print("DataBuffer: pop called. %d load\n", buffer.size());
return READY;
}
main()
{
int type;
double op2;
char s[MAXOP];
while ((type = getop(s)) != EOF)
{
switch (type)
{
case NUMBER:
push(atof(s));
break;
case COMMAND:
stackCommands(s[0]);
break;
case UNARY_FUNCTION:
push(unaryFunc(s, pop()));
break;
case BINARY_FUNCTION:
op2 = pop();
push(binFunc(s, pop(), op2));
break;
case ASSIGNER:
assigner = 1;
break;
case VARIABLE:
if (assigner)
{
push(op2 = pop());
setVariable(s, op2);
assigner = 0;
}
else
{
push(getVariable(s));
}
break;
case OPERATOR:
op2 = pop();
push(op(pop(), s[0], op2));
break;
case '\n':
if (assigner)
{
index--;
rpnError("No variable to assign to.", index);
index = -1;
assigner = 0;
break;
}
if (!underCommand && canPop())
{
push(op2 = pop());
setVariable("ans", op2);
stackCommands('T');
stackCommands('C'); /* empty stack and start a new line. */
}
underCommand = 0;
index = -1;
break;
case ERROR:
rpnError(err, index);
index = -1;
break;
}
}
}
