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Earlier today (actually yesterday due to my time-zone) I was attempting a programming interview using Visual Studio 2012 for C++ on Interview Street (which uses g++).
To be brief, I came across several compilation errors1 when I was using
#include <cstring> which was provided by the skeleton code in one of the question, and after turning to
#include <string> all compilation errors magically disappeared.
However, upon submission to Interview Street, I had to add c back; otherwise I got compilation errors.
It was the first time I was bitten by non-standardization....
My question is: what inside <string> and <cstring> took me (precious) more than half an hour?
1 For anyone who is curious:
One error by Visual Studio 2012 if using <cstring> is:
error C2338: The C++ Standard doesn't provide a hash for this type.
in
c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef
possibly for string as key in unordered_map
One error by g++ if using <string> is:
'strlen' was not declared in this scope
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Apparently cstring is for C++ and string. h is for C. One thing worth mentioning is, if you are switching from string. h to cstring , remember to add std:: before all your string function calls.
Use string. cstring is so 1970's. string is a modern way to represent strings in c++. you'll need to learn cstring because you will run into code that uses it.
CString accepts NULL-terminated C-style strings. CString tracks the string length for faster performance, but it also retains the NULL character in the stored character data to support conversion to LPCWSTR . CString includes the null terminator when it exports a C-style string.
You can (if you need one) always construct a C string out of a std::string by using the c_str() method. Show activity on this post. C++ strings are much safer,easier,and they support different string manipulation functions like append,find,copy,concatenation etc.
The cstring header provides functions for dealing with C-style strings — null-terminated arrays of characters. This includes functions like strlen and strcpy. It's the C++ version of the classic string.h header from C.
The string header provides the std::string class and related functions and operators.
The headers have similar names, but they're not really related beyond that. They cover separate tasks.
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<cstring> has the C string code from the C header string.h. C++ has a convention where C headers have the same base name, except for a leading c and no trailing .h. All the contents are available under the std:: namespace.
<string> has the standard library std::string and related functions
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