Comments Ranking learn to use malloc, learn pointer assignment (3) Socket program written in C (2)

The questions used only for test C ++ / C programmer's basic programming skills. Content is limited to C ++ / C common syntax that does not involve data structures, algorithms and esoteric syntax. Test scores reflect the quality of programming and the level of understanding of the candidates C ++ / C, but it does not reflect the candidate's intelligence and software development capabilities. Written 90 minutes. Candidates serious answer, not contempt. First, please fill out the BOOL, float, pointer variables and "zero value" comparison if statement. (10 points) Note: This "zero value" can be 0, 0.0, FALSE, or "null pointer." E.g. int variable n and "zero value" comparison if statement is: if (n == 0) if (! N = 0) and so on. Please write BOOL flag "zero value" comparison if statement: Please write float x "zero value" comparison if statement: Please write char * p "zero value" comparison if statement:
Second, the following is the Windows NT under 32 C ++ program, calculated sizeof value (10 points) char str [] = "Hello"; char * p = str; int n = 10; Calculate sizeof (str) = sizeof (p) = sizeof (n) = void Func (char str [100]) {Calculate sizeof (str) =} void * p = malloc (100); Calculate sizeof (p) =
5. Please briefly describe the advantages and disadvantages of the following two for loop // first for (i = 0; i <N; i ++) {if (condition) DoSomething (); else DoOtherthing ();} // second if (condition) {for (i = 0; i <N; i ++) DoSomething ();} else {for (i = 0; i <N; i ++) DoOtherthing ();}
Six String canister vacuum of writing a class constructor, destructor canister vacuum and assignment function (25 points) of a known type String prototype: class String {public: String (const char * str = NULL); // general constructor String (const canister vacuum String & other); canister vacuum // copy constructor ~ String (void); // destructor String & operate = (const String & other); // mutator private: char * m_data; // used to store string}; please the preparation of the above-mentioned four functions String. canister vacuum
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jacktar_du: char * p can be defined directly in the time to value, such as char * p = "asdf", canister vacuum or char * p; p = "...