Is the an easier way, i get errors here
Code:bool valid::validFloat(const std::string& value) { float f; std::istringstream strin(value); /* error C2440: 'initializing' : cannot convert from 'std::string' to 'int' */ strin >> f; if (!strin) return false; else return true; }
Did you remember to include the appropriate headers? Other than that I suggest that you post the smallest and simplest program that demonstrates the problem since what you posted looks like it should not result in a compile error.
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
Forgot #include <sstream> ...
This is a definite case of MSVC++'s absurd error recovery, and you're missing <sstream>. (There should be three other errors on that line, one of them stating that istringstream is not a member of std or something to that effect.
Anyway, you can just do
return strin;
at the end.
All the buzzt!
CornedBee
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
you mean..
?Code:bool valid::validFloat(const std::string& value) { float f; std::istringstream strin(value); return strin >> f; }
Or perhaps
since we not only want a float to be parseable, but it should also be the only thing in the stream.Code:return strin >> f && strin.eof();
Note: this fails if you want trailing whitespace to be valid. You could do this:
Code:return strin >> f >> std::ws && strin.eof()
All the buzzt!
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
May i hijack this thread for another float related...
I'm trying to diplay 2 decimals after a point but this fails
Any reasons?Code:cout << "Contract Balance Owed " << setprecision (2) << setw(8) << bal << "\n";
You just need additional manipulators. fixed suppresses scientific notation. showpoint makes a point visible even when there is a fractional part of zero.
For example: cout << showpoint << fixed << setprecision(2) << bal << endl;
thanx
