All of the possibilities are wrong to first order. This is a bad exam question and you may tell your instructor I said so. (a) is the least wrong answer. getservbyname could be used by a generic TCP client to determine what port of a server to connect to, given a textual service name. However, … Read more
It’s called reflection, you cannot do this with c++. Use another languages like java or c# for that. 6 solved C++ – Programmatically call correct function parameters [duplicate]
I figure out what the error is for those in future who might be banging their head wondering what went wrong. It’s actually really simple. A small typo actually. Too bad M$ have horrible error message that don’t really tell you where the error might have happened: Simply replace this line: public void GetObjectData(SerializationInfo info, … Read more
Use sets! static int NumberOfDigits(int a) { return new HashSet<char>(Math.Abs(a).ToString()).Count; } We make a into a string and then turn the string into a set of characters. Since sets cannot contain duplicate values, the count of the set is the number of distinct digits. solved How to count the number of different digits in a … Read more
None of those two cases are right. Case 1 only worked because you got lucky, probably by giving a short string as input. Try something like “bfjabfabjkbfjkasjkvasjkvjksbkjafbskjbfakbsjfbjasbfjasbfkjabsjfkbaksbfjasbfkja” and you’ll suffer a seg fault, most likely. You should have a block of memory associated with str, either on the stack by declaring an array for it … Read more
Think of it as a greedy algorithm, it will take as many characters as possible, if they make sense. Example: i+ // good, keep going i++ // good, keep going i+++ // not good, start new token + // good, keep going +- // not valid, start new token – // good — // good … Read more
In your example you can have TWO different causes for the NullReferenceException: – Value `user` is null; – `user.FirstName` is null. I assume you’ve checked already if user is not null, so lets skip that one. Now lets assume that user.FirstName is null, what happens then? The first condition string.IsNullOrWhiteSpace(user.FirstName) will result to true. Is … Read more
No, you cannot. Functions cannot be generally declared inside another function. You can only define them. The language was designed like that. Also see these: Function Declaration and Function Prototypes C – Functions Declaring a function – function prototypes I think you need a good C book or tutorial. You can choose a good book … Read more
Don’t force a flush: cout << ret[i] << endl; That is really inefficient forcing the stream to flush every time. Rather simply use the \n; cout << ret[i] << `\n’; Also because C++ tried to maintain backward compatibility with C the C++ iostream are linked to the C iostreams. It is expensive to keep them … Read more
void is not a complete type. It is only used either in a function definition to state that it either takes no parameters or returns no value, or as a generic pointer i.e. void *ptr. As such, a variable of type void cannot exist. solved C: error: array has incomplete element type ‘void’ [closed]
The are two errors (compile time errors, at least). First of all, cin, cout and endl are not known, you have to write them as std::cin, std::cout and std::endl. The second problem is here: switch (choice); Remove that semicolon and it’s fine. The reson why it’s not working with the semicolon is because then switch … Read more
Below is my attempt. There were some formatting issues but the trickiest problem was that getValue() is a const function. class Int { private: int num; public: Int() { num = 0; } Int(int n) { num = n; } // getValue is a const function as it does not alter object ‘n’. int getValue() … Read more
Two arrays of 10^9 will use GBs of memory in any language. e.g. 2 * int[10^9] requires 8 GB of memory, whether you use C or Java. The real solution is likely to be to not create the arrays at all as they don’t appear to be needed. You can process the data as you … Read more
I changed the crystal report objects font to Arial Unicode MS and it works for me solved Crytal Report not showing arabic when exported to PDF
for(;*s; r=(r<<1)|(*s++ – ‘0’));//explain this is: int r=0; while(*s){ int m=*s-‘0’; r=r*2 + m; ++s; } As commented above It will parse(convert) your binary string to number solved What is the output of the following code and how?