@programminginc - страница 2825

Evil grin

conan, vcpkg

Thanks

klimi

if i were you i would try QT group

Anonymous

@en_it_chats

Anonymous

If I have a variable declared as follows static const int a = 5 And I want to pass this to a function that has this definition: int dosomething(int* a) Is it bad practice to do dosomething((int*) a) Assume the function never modifies a

Anonymous

Assume C11

Vlad

If I have a variable declared as follows static const int a = 5 And I want to pass this to a function that has this definition: int dosomething(int* a) Is it bad practice to do dosomething((int*) a) Assume the function never modifies a

Why would you cast int into the pointer?

Vlad

Shouldn't you just take its address and call it a day?

Diego

If its a constant you won't do much by passing its address either

Diego

int and pointer are the same size In C++ an int usually represents the size of a processor's word, that is, its registry size (1 byte for 8 bit processors, 2 for 16 bit, 4 for 32bit, and so on) And a pointer... is quite literally a word

Diego

So you'll be using as much memory by passing the pointer as copying the int by value, and this int, you can't modify

Diego

Unless you want to use int as a memory offset, that'd be a different scenario entirely But in any case, you should do &MyInt

Vlad

If I have a variable declared as follows static const int a = 5 And I want to pass this to a function that has this definition: int dosomething(int* a) Is it bad practice to do dosomething((int*) a) Assume the function never modifies a

If you only read via pointer inside the function why not declare an argument const?

Anonymous

If its a constant you won't do much by passing its address either

The purpose is to put it in .rodata

Anonymous

So that modifications to this value cause a crash

olli

int and pointer are the same size In C++ an int usually represents the size of a processor's word, that is, its registry size (1 byte for 8 bit processors, 2 for 16 bit, 4 for 32bit, and so on) And a pointer... is quite literally a word

There are platforms where uintptr_t is not defined because you can't represent a pointer using an integral value. Leaving exotic platforms aside int is most likely 32 bit even on an 64 bit os Iirc int is 16 bit on some common 8 bit AVR Compilers

Diego

There are platforms where uintptr_t is not defined because you can't represent a pointer using an integral value. Leaving exotic platforms aside int is most likely 32 bit even on an 64 bit os Iirc int is 16 bit on some common 8 bit AVR Compilers

Oh, okay

Anonymous

int and pointer are the same size In C++ an int usually represents the size of a processor's word, that is, its registry size (1 byte for 8 bit processors, 2 for 16 bit, 4 for 32bit, and so on) And a pointer... is quite literally a word

> int and pointer are the same size Please show where C++ standard states so

Anonymous

https://godbolt.org/z/nTbMh8

Diego

There are platforms where uintptr_t is not defined because you can't represent a pointer using an integral value. Leaving exotic platforms aside int is most likely 32 bit even on an 64 bit os Iirc int is 16 bit on some common 8 bit AVR Compilers

Thank you for correcting me

Diego

> int and pointer are the same size Please show where C++ standard states so

My bad, I was misinformed 😅

Emmanuel

#include<stdio.h> int main () { int a,b; int length; int array[9]; printf ("Enter Length of the array: "); scanf ("%d", &length); printf ("Give the range [a,b]: "); scanf ("%d %d", &a ,&b); printf ("Number from the range[%d,%d]: ", a, b); for (int i = 0; i < length; i++) { scanf ("%d", &array[i]); } for (int j = 0; j < length; j++) { if (array[j] > 0) { printf("%d\n",array[j]); } else{ continue; } } }

Emmanuel

Can someone translate for me into c++?

Alex

#include<stdio.h> int main () { int a,b; int length; int array[9]; printf ("Enter Length of the array: "); scanf ("%d", &length); printf ("Give the range [a,b]: "); scanf ("%d %d", &a ,&b); printf ("Number from the range[%d,%d]: ", a, b); for (int i = 0; i < length; i++) { scanf ("%d", &array[i]); } for (int j = 0; j < length; j++) { if (array[j] > 0) { printf("%d\n",array[j]); } else{ continue; } } }

thats valid c++ code

Nomid Íkorni-Sciurus

thats valid c++ code

I think she means using STL

Anonymous

Hello everybody I'm a c developer, I'd like to start with c++ from c point of view what do you suggest for me?

Nomid Íkorni-Sciurus

Hello everybody I'm a c developer, I'd like to start with c++ from c point of view what do you suggest for me?

not to use C++ unless you have a specific reason to do it. otherwise, to unlearn anything you might have seen with C and to start out again from zero knowledge.

Alex

Hello everybody I'm a c developer, I'd like to start with c++ from c point of view what do you suggest for me?

learn c++ oop; stop using raw pointers, preprocessor; pass val by ref instead of pointer; use c++ lib instead of c

Nomid Íkorni-Sciurus

yeah, basically, to unlearn C ahah

Anonymous

Hello everybody I'm a c developer, I'd like to start with c++ from c point of view what do you suggest for me?

Read Mayer's books Read C++ Core Guidelines Watch CppCon Watch Jason Turner

Ghadah

Hi

Ghadah

I need a group for me + advanced programming in c

Anonymous

Hello, some of us are more advanced than others... I'm just mediocre myself.

Anonymous

Hello everybody

Anonymous

/get cbook

sms

Rose

sms

What is purpose of this grop

Anonymous

Classes in C++: Write the program👉class rectangle

Anonymous

Example: Class circle { Private; double radius: Public: void setRadius(double r) double getDiameter (); double getArea(); double getCircumference(); };

Anonymous

Example: Class circle { Private; double radius: Public: void setRadius(double r) double getDiameter (); double getArea(); double getCircumference(); };

You were said to write class rectangle and you wrote class circle, really?

Anonymous

You were said to write class rectangle and you wrote class circle, really?

Yeah I need a clue for class rectangle

Anonymous

Yeah I need a clue for class rectangle

What's the problem?

Anonymous

Open a textbook from elementary school to read about rectangles and their characteristics

Anonymous