olli
struct Foo {
void Bar();
void Qux();
};
void Foo::Bar() {
// this is the object Bar is
// called on, can be used to
// access other non-static
// member or call non-static
// functions
this->Qux();
(*this).Qux();
}
void Foo::Qux() {}
int main() {
// no this here, main is never
// called on an object
Foo F{};
// PF points to a Foo object,
// can use -> to call member
// functions
Foo *PF = &F;
PF->Bar();
// Derefercing and using .
// works as well
(*PF).Bar();
}
Henry
Hi I need one who would teach me itineration operation
Henry
I couldn't understand it from the book
Alex
hi. what don`t you understand exactly?
Henry
Like when writing a pyramid pascal triangle
Artöm
A loop executes statements in body while condition holds
Peejay
Good day guys. Am glad to be here. It my first time
Anonymous
Hello!
Let's say there are 2 functions func1, func2 defined inside a class1.
Now while defining func1outside the class, i have to use func2, now should i directly parse func2 or class1.func2 ??
if you want to return func2 then you have to use class1::func2 in the return type, otherwise once you are in the scope of the class through class1::func1(, you can just use any member of the class without requiring an explicit mention of the this pointer.
Anonymous
class1::member class1::func(member a, int b) {
// ^ required here and nowhere else
member c = d;
}
@unchanted
Is it possible to create a linked list without using pointer concept?
I mean "what if i wish to give an address to the next node as an input?"
What could be an approach to this situation
Artöm
Why not just use pointers?
piggyho
Is it possible to create a linked list without using pointer concept?
I mean "what if i wish to give an address to the next node as an input?"
What could be an approach to this situation
you can do it with arrays where the pointer is the index
@unchanted
Why not just use pointers?
If user wish to give address in case he/she wishes to trace where the data is stored
Artöm
An allocator can do it
Artöm
Read about what Allocator does and go through std::allocator interface
@unchanted
Ok
@unchanted
Thanks
PO
who can explain to me what does it mean Segmentation Fault (Core dumped)?
Anmol
who can explain to me what does it mean Segmentation Fault (Core dumped)?
https://en.wikipedia.org/wiki/Segmentation_fault
Arthur
who can explain to me what does it mean Segmentation Fault (Core dumped)?
looks like you trying to access to memory cell that you shouldnt
PO
I get error when execution of the file come to here
PO
nsigned int i, j;
unsigned int range = 115;
unsigned int target = &matrix[i][j];
printf("\n \n * * * * * * * Black & White * * * * * * * \n \n");
for (i = raw - 1; i >= 0; i--) {
for (j = column - 1; j >= 0; j--){
if(target< range){
matrix[i][j] = 0;
}else{
matrix[i][j] = 255;
}
}
}
Anmol
Anmol
I want compare the element inside of the array with 115
If you still don't understand what's wrong here, you should consider learning the basics
PO
If you still don't understand what's wrong here, you should consider learning the basics
I think I have to change targe from simple vriable to an array
Anmol
I think I have to change targe from simple vriable to an array
Here's another hint. "uninitialised variables"
Arthur
Yes, you are trying to get the address of two dimensional array (its hex) and put it into unsigned int (0-255 range int only) for what?
PO
yep
Mar!o
PO
Yes, you are trying to get the address of two dimensional array (its hex) and put it into unsigned int (0-255 range int only) for what?
because I have to compare, each element of array with 115. if the element is less than 115 I should replace it with 0 and higher I have to replace with 255
Anmol
you cannot store a pointer (&) in an unsigned int - it's not safe
There's that too
Arthur
first of all - store pointers in a ponter type like
int *pointer = &address;
Arthur
PO
I don't know, it's gcc compiler on Ubuntu
Anunay
cs50 is a harvard course lol
Anunay
https://cs50.harvard.edu/summer/2020/
Arthur
https://cs50.harvard.edu/x/2020/psets/4/filter/less/
Arthur
check that link, its about your task - blur, grayscale, reflection, and sepia on bitmap images
PO
PO
check that link, its about your task - blur, grayscale, reflection, and sepia on bitmap images
thanks My projet is about pnm Image file modification
Arthur
PO
ok
PO
I get it why
PO
I have copied and pasted my previous loop and I had forgotten to change the vlaue
Anonymous
I want to object move automatic in c
Anonymous
How to write code
Anonymous
Need small projects in c coding suggestion
Anonymous
Lol wat
Anonymous
I need to code for move object automatic like snake game
PO
How do you compare an element of an 2d array with a number?
PO
guys
PO
Anonymous
I'm currently learning c++
Anonymous
How do you guys survive 😰😰
Anonymous
Anonymous
please get a CLion subscription (it's free for students). you'll learn to use tools
Anonymous
and get some help writing better C
klimi
How do you guys survive 😰😰
you mean sleep deprivation, depression, loneliness and lack of motivation?
Anonymous
do you understand why it get me 18 18 18
40 28 24
73 61 54
no clue. your code just looked ugly, so i suggested using CLion
Anonymous
sometimes just following the basic clangd suggestions fixes stuff
klimi
ye clang is actually pretty nice in this
Anonymous
you mean sleep deprivation, depression, loneliness and lack of motivation?
Damn😅😅 and I was complaining about js
Anonymous
what is that?
https://www.jetbrains.com/clion/ don't get attached to the ide. learn the tools it integrates with (clangd, clang-tidy, CMake, editorconfig/clang-format, etc etc)
Anonymous
then integrate them to your Atom (or VSCode) workflow
PO
But It doesn't help to resolve my problem
Anonymous
But It doesn't help to resolve my problem
maybe it will. maybe you are doing some basic mistake like uninitialised variable above.