hi guys i have a question about constant variable i tried to define consts in a class but compiler gives errors.do you guys have any suggestion?can i use #define instead of const?what wrong with this code?
Code://this class calculates circle perimeter of a circle ,c=2*pi*r class circle { const float pi=3.14; const int r=2; const int m=4; public: void calc() { //arguments } };
You can't define const members that way. In your case, i suggest using 'static const'.
Devoted my life to programming...
For your purpose, static const will be fine. Otherwise you have to initialize them using the constructor (using initializer lists).
That will thankfully be fixed in the next version of the standard.
Originally Posted by Adak
Members cannot be initialized this way. Const members/references must be all initialized in all constructors. These "constants" should not be non-static members.
Code:static const float pi = 3.14; class circle { int r_; // float? int m_; // float? public: circle(int r, int m) : r_(r), m_(m) { } };
good ！
thanks guys.
