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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();
}
Code:
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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04-22-2008
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isdigit() is doing what it is supposed to do. It filters out the character stream into digits and non-digits. So the minus will be discarded as not being a digit. Change the code so that it skips over the sign and after reading in the digit prepend the sign to it.
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