[Solved] How to understand [], (), compound literal operator, . and -> are postfix operators?

The language specification defines the syntax, and doesn’t care what you call the parts that make up the language. In abc->def, the first operand is abc, and -> is the operator and def is the second operand, but it is restricted to an identifier is the name of a member of the structure or union … Read more

[Solved] How this is calculating size in c?

First and foremost, please don’t write code this way… *(&arr + 1) is undefined behavior… Note: This answer assumes sizeof(int) = 4. What is arr? It’s an array of 9 ints printf(“%zu\n”, sizeof(arr)); // 36 bytes printf(“%p\n”, (void *)arr); // 0x7ffed90f48a0 What is &arr? It’s a pointer to an array or ints = int (*)[9] … Read more

[Solved] How to generate pseudorandom no. easily? [closed]

Here’s a simple example that generates 10 evenly distributed random numbers in the range -42 to 42 : #include <iostream> #include <functional> #include <random> int main() { std::random_device seed_device; std::mt19937 engine(seed_device()); std::uniform_int_distribution<int> distribution(-42, 42); auto rnd = std::bind(distribution, std::ref(engine)); for (int i = 0; i < 10; ++i) { std::cout << “random number: ” << … Read more

[Solved] How to store a file in C

That is possible depending on the OS. Modern OSes have memory protection which don’t allow these kind of operations. But if you go ahead and disable all of those security features, you can send and load the binary remotely into memory and execute it. And that still involves pretty advanced stuff. Some reading: https://www.blackhat.com/presentations/bh-usa-07/Harbour/Whitepaper/bh-usa-07-harbour-WP.pdf https://superuser.com/questions/241259/how-to-run-a-local-application-on-a-distant-server-with-ssh … Read more

[Solved] Does using the iterator member function “empty()” only work on certain vector types?

empty() is not “an iterator member function”. You are not calling empty() on the iterator – you are dereferencing the iterator, and calling empty() on the vector element that the iterator refers to. It might be clearer if you replace iter->empty() with an equivalent form (*iter).empty() In still other words, auto iter = vec.begin(); iter->empty(); … Read more

[Solved] Text-box Functions

The problem related to comma in the Textbox is because you are using an Int64.TryParse(), so the expected value are an integer… When you use a value with comma, isn’t a integer value anymore, so you need to use Double.TryParse() or Decimal.TryParse(). But, even using this, I recomend you to use a MaskedTextbox (like described … Read more

[Solved] What exactly is a PRNG seed and how does it work in c++?

“I don’t really understand what a seed is” – A seed in the context of a Pseudo Random Number Generator (PRNG) is a starting value to use for the generation of the pseudo random sequence. A PRNG that starts with the same seed will (in most cases) produce the same sequence of random numbers. This … Read more

[Solved] Why is this segfaulting? Can someone explain the valgrind error?

Valgrind says that the illegal write is occurring at Address 0x6172676f72502074. If you look at that address as ASCII characters, it’s: argorP t, or converting from little endian: t Progra. This looks like part of one of your menu items, “9. Abort Program”. Maybe the bug is that menu_init() is writing past the end of … Read more

[Solved] If statement continuing when false (multiple || and &&)

Solution: I put all of the conditional statements inside of if (!allCorrect[i]) so it looks like this if (!allCorrect[i]) { if (int.TryParse(parameters[i], out INT)) { if (_command.ParameterTypes[i] == EVariableType.INT) { allCorrect[i] = true; } else { allCorrect[i] = false; } } } if (!allCorrect[i]) { if (float.TryParse(parameters[i], out FLOAT)) { if (_command.ParameterTypes[i] == EVariableType.FLOAT) { … Read more

[Solved] Search column name in csv file using c# [closed]

This should work public bool CheckFile() { StreamReader sr = new StreamReader(File.Open(@”YourFilePath”, FileMode.Open)); string toCheck; using (sr) { toCheck = sr.ReadToEnd(); } return toCheck.Contains(“fileName”); } solved Search column name in csv file using c# [closed]