Is this comparison possible to do in C++?
std::string name = "John";
if (name == "Tom")
flag = true;
else
flag = false;
2 Answers
Yes it is, because std::string overloads operator == for const char*.
Alternatively, you can just write
flag = name == "Tom";
or use std::string::compare (returns 0 if the strings match)
Comments
To compare srtings in c++, I recommend you to use STRCMP from:
#include <string.h>
....
STRCMP(name,"Tom"); // This will return 0 if they are equal
so you should use it as:
if (STRCMP(name,"Tom")==0)
flag = true;
else
flag = false;
remember to use #include < string.h>
7 Comments
PaperBirdMaster
Why would be better an old fashioned function or macro or wathever
STRCMP is than the std::basic_string comparision operators?
PlasmaHH
there is no such thing as STRCMP in standard C++.
PlasmaHH
@Sascuash: it seems to me that most people find op== more human friendly, also given that if he meant
strcmp from C, the call would look different (besides that it is more inefficient and can even lead to wrong results, depending on the contents of name)PlasmaHH
@Sascuash: not at all, I personally can clearly distinguish = and ==. And if you can not, you can still write
if(name=="Tom"). And even if it was, this still does not resolve the cases where both lead to different results.
utnapistim
@Sascuash, first, STRCMP is a macro, defined (if I remember correctly) for Windows C++ libraries (i.e. not standard C++). Second, please don't recomment C string processing functions in C++ - they lead to bad/unsafe C++ coding and miss the advantages of modern C++ code (RAII comes to mind). String comparisons in C++ should be made using std::string (that is the reason std::string is there for).
|
flag = name == "Tom";??flage = (name == "Tom");