MESSAGE
| DATE | 2010-02-02 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] C++ Workshop I datatypes cont..
|
Hello,
first, thank you for starting this. I know it is hard work to put this together, and it seems unfair to chritisize this when I have not yet contributed anything.
I will try to be constructive:
When talking about data types I think it is important for the sake of better coding to use C++ constructs rather than pulling these old c limits.h.
C++ data types, unlike java, are implementation dependent. To deal with this the C++ standard provides for the basic data type (short, int, float, double, char, unsigned, long) a standardized interface.
numeric_limits is the C++ way to deal with the implementation details of basic types.
here a small example how to use numeric_limits:
= limits_int.cpp ===============================
#include
#include
using namespace std;
int main () {
cout << "Minimum value for int: " << numeric_limits::min() < cout << "Maximum value for int: " << numeric_limits::max() < return 0;
}
================================================
the functions min and max are defined statically so you can call the directly.
The class numeric_limits provides you wit a set of very useful information:
min()
max()
digits
digits10
is_signed
is_integer
is_exact
radix
epsilon()
round_error()
min_exponent
min_exponent10
max_exponent
max_exponent10
has_infinity
...
to name the more important ones.
Henning
--
Henning Follmann | hfollmann-at-itcfollmann.com
it consultant | www.itcfollmann.com
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