Recent questions tagged Pointers

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pointers - c++ same strings not equal (char* actually)

I have a problem with passing an argument into my program, seems to not be equal to what I put in as ... how to handle it differently though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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535 views

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pointers - C++ classes with members referencing each other

I'm trying to write 2 classes with members that reference each other. I'm not sure if I'm doing something wrong ... does't seem to be working! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Ampersand(&) and scanf in C?

I have the following multiple-choice question and I cannot figure out why (A) and (C) are incorrect, any explanation ... c; scanf("%c", c); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Passing address, but it is working like call by value in C?

Hello I am a beginner in C programming language. Recently I read about call by value and call by address. ... function does not reflect caller? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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502 views

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pointers - What exactly is a reference in C#

From what I understand by now, I can say that a reference in C# is a kind of pointer to an object which ... is defined at a low level. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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430 views

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pointers - What are the parameters in this C qsort function call?

qsort(bt->rw[t], bt->num[t], sizeof(TRELLIS_ATOM *), (int (*)(const void *,const void *))compare_wid); bt->rw[ ... * b ) { ... return x; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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573 views

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pointers - C++ - Difference between (*). and ->?

Is there any difference in performance - or otherwise - between: ptr->a(); and (*ptr).a(); ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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pointers - using ref with class C#

I want to give a certain linked list to a class I am making. I want the class to write into that list (eg by ... <int> list){ _myList = list; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - What's the difference between the types - int * and int *[100] in C?

Kinda of a noob so don't kill me here. What's the difference between the following codes? int *p; //As i ... this is a pointer to an array. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How do I pass a reference to mutable data in Rust?

I want to create a mutable struct on the stack and mutate it from helper functions. #[derive(Debug)] struct Game ... ` What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

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pointers - Compile-time generic type size check

I'm attempting to write Rust bindings for a C collection library (Judy Arrays [1]) which only provides itself ... as a learning exercise anyway. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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480 views

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pointers - Passing by reference and value in Go to functions

I am a bit confused about passing by reference and value in Go. I've seen this explained of the * in ... a pointer address as a parameter. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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667 views

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pointers - Copying structure in C with assignment instead of memcpy()

Up until recently, I have only seen copying of structure fields done with memcpy(). In classes and online ... use memcpy() in general? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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738 views

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pointers - How to copy an interface value in Go?

How to copy an interface value in Go? My User interface: type User interface { Name() string SetName(name ... the original doesn't change? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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601 views

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pointers - What does 'return *this' mean in C++?

I'm converting a C++ program to C#, but this part has me confused. What does return *this mean? template< ... } How would it translate into C#? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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pointers - Are C stack variables stored in reverse?

I'm trying to understand how C allocates memory on stack. I always thought variables on stack could be ... stack variables stored upside down? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

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pointers - Segmentation Fault when attempting to print value in C

The following C code returns a "segmentation fault" error. I do not understand why it does not return the value 20. What ... ",*n); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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679 views

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pointers - UIApplication.sharedApplication().delegate as AppDelegate causes EXC_BAD_ACCESS using it on swift unit test

I'm trying to use unit test in swift to test some of the real application behaviour. When i try to cast ... not familiar with low level details. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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481 views

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pointers - Passing a modifiable parameter to c++ function

Provided, I want to pass a modifiable parameter to a function, what should I choose: to pass it by pointer ... just a matter of personal taste? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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749 views

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pointers - Difference between %d and %p printf format string directives in c language?

I want to get a detailed explanation on the difference between using %d and %p type for printing pointer. ... with the memory locations too? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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597 views

1 answer

pointers - C++ vector<vector<double> > to double **

I'm trying to pass a variable of type vector<vector<double> > to a function F(double ** mat, int m, int ... give me some hints on this? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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493 views

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pointers - C++ function called without object initialization

Why does the following code run? #include <iostream> class A { int num; public: void foo(){ num=5; std::cout ... of type A has been created yet? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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858 views

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pointers - both asterisk and ampersand in a parameter c++

I am reading a book about Binary Search Tree and something weird came up. class BST { public: void insert(const ... Pointer of the address of t? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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pointers - C++ - Get value of a particular memory address

I was wondering whether it is possible to do something like this: unsigned int address = 0x0001FBDC; // Random ... address in memory ? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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pointers - Find address of constant in go

We have written one program by which we try to find an address of a constant. Is it possible to do it like ... find the address of a constant? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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945 views

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pointers - Invalid type argument of -> C structs

I am trying to access items in an array of structs and print the structs fields as follows printList(Album * ... doing wrong with this pointer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

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pointers - malloc in C, but use multi-dimensional array syntax

Is there any way to malloc a large array, but refer to it with 2D syntax? I want something like: int ... do this without using another function? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

1 answer

pointers - Range references instead values

I saw that range returns the key and the "copy" of the value. Is there a way for that range to return the ... any other way to modify the value? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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