This error often means that some function has a declaration, but not a definition. Example: In your case, the definition cannot be found. The issue could be that you are including a header file, which brings in some function declarations, but you either: do not define the functions in your cpp file (if you wrote … Read more
How does passing a statically allocated array by reference work? Does (&myArray)[100] have any meaning or its just a syntax to pass any array by reference? I don’t understand separate parenthesis followed by big brackets here. Thanks.
Variables: static variables exist for the “lifetime” of the translation unit that it’s defined in, and: If it’s in a namespace scope (i.e. outside of functions and classes), then it can’t be accessed from any other translation unit. This is known as “internal linkage” or “static storage duration”. (Don’t do this in headers except for … Read more
It’s a pointer, so instead try: Basically the operator . (used to access an object’s fields and methods) is used on objects and references, so: If you have a pointer type, you have to dereference it first to obtain a reference: The a->b notation is usually just a shorthand for (*a).b. A note on smart … Read more
This operation: determines if A is not equal to B. If they’re not equal, it evaluates to true. If they are equal, it evaluates to false. It’s just a boolean comparison operation. This operation: is not a boolean comparison. It sets the value of A to the negated value of B. (When used in this … Read more
If you have a C++11 compiler, I would suggest using a range-based for-loop (see below); or else use an iterator. But you have several options, all of which I will explain in what follows. range-based for-loop (C++11) In C++11 (and later) you can use the new range-based for-loop, which looks like this: The type char … Read more
The compiler is allowed to make one implicit conversion to resolve the parameters to a function. What this means is that the compiler can use constructors callable with a single parameter to convert from one type to another in order to get the right type for a parameter. Here’s an example class with a constructor … Read more
The syntaxes and are exactly the same as when in a function parameter list (I left out the optional names). Additionally, an array name decays to a pointer to the first element when passed to a function (and not passed by reference) so both int firstarray[3] and int secondarray[5] decay to int*s. It also happens … Read more
I’m currently working on a card game, and I’m having trouble with some initialization code: The trouble is that my compiler’s telling me that cards++ is not an l-value. I’ve read up on the whole pointer-array equivalence thing, and I thought I understood it, but alas, I can’t get it to work. My understanding is … Read more
You are getting Floating point exception because Number % i, when i is 0: Just start the loop at i = 2. Since i = 1 in Number % i it always be equal to zero, since Number is a int.