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04-22-2008
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C++ how to isdigit() a negative number?
hi people, I have a function which I am passing a stream which is basically postfix notation Code:
if(isdigit(in.peek()))
{
in >> number;
nums.push(number);
}
else if (strchr("+-*/", in.peek( )) != NULL)
{
in >> symbol;
do_operation(symbol, nums, okay);
}
else
{
in.ignore();
}
the stream I am passing would look like this: Code:
2 -3 + which is effectivley 2 + -3 the problem is that isdigit(in.peek()) is reading the '-' as a char and not part of the negative number..... what can I do? Cheers in advance |
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