@programminginc - страница 2540

Vlad

The output of this code “i’m in scope” why?

Because unsigned int truncates to char on comparision

Vlad

Basically it does x == (y & 0xFF)

R

Is c++ primer 5th edition is good to get started with c++

Anonymous

If you wanna learn some c++11 then better choose 6th edition

R

I want learn at beginners stage

R

Which YouTube you can recommend apart from new boston

Anonymous

Don't watch vedio, read book and go through example

Vlad

I want learn at beginners stage

Well I'd recommend learning c++11 first. And then learn legacy stuff only when needed.

R

Thank you for help 😊

布丁

rust being memory safe means it must have sacrificed some execution speed

that is a common misconception. Most of the checks are done at compile time

Anonymous

Because unsigned int truncates to char on comparision

No

Vitaliy ◀️TriΔng3l▶️

Because unsigned int truncates to char on comparision

Waaait… Not the char (I assume signed here) gets promoted to signed int?

Anonymous

Waaait… Not the char (I assume signed here) gets promoted to signed int?

It promotes to unsigned int

Vitaliy ◀️TriΔng3l▶️

It promotes to unsigned int

Through signed?

Anonymous

(unsigned)-1 == UINT_MAX

Anonymous

Through signed?

Doesn't matter

Vlad

Well that's weird that 0xFF promotes to 0xFFFFFFFF. Guess I'm gonna have to roll with it tho :P

Vitaliy ◀️TriΔng3l▶️

Well that's weird that 0xFF promotes to 0xFFFFFFFF. Guess I'm gonna have to roll with it tho :P

It's sign-extended because it's originally signed

Anonymous

Through signed?

char can be either signed or unsigned — it depends on a compiler At least that's the rules in C++

Vitaliy ◀️TriΔng3l▶️

char can be either signed or unsigned — it depends on a compiler At least that's the rules in C++

Yes, I mean, in case it's signed

Anonymous

Yes, I mean, in case it's signed

Well probably yes

Vlad

char can be either signed or unsigned — it depends on a compiler At least that's the rules in C++

And additional bonus for a changed behavior once char is unsigned in the system.

Vlad

Well played :P

Vitaliy ◀️TriΔng3l▶️

#include <stdint.h> uint32_t to_uint32(int8_t i8) { return uint32_t(i8); } movsx ooooh :o

Vitaliy ◀️TriΔng3l▶️

but well, makes sense, for instance, if it was float rather that int8_t

Vitaliy ◀️TriΔng3l▶️

respecting traits of the original type

Emir

The output of this code “i’m in scope” why?

So when we comparing to different size variable the small one promoted the big one, is it true? are line comments true? bits?

Vitaliy ◀️TriΔng3l▶️

Bits are not true if it's two's complement

Vitaliy ◀️TriΔng3l▶️

But yes

Emir

Bits are not true if it's two's complement

how can i see my variable on ram? is it possible?

Vitaliy ◀️TriΔng3l▶️

how can i see my variable on ram? is it possible?

You can print it with an unsigned format (like %hhx for printing an unsigned char as hexadecimal), or use memory view in a debugger

Emir

You can print it with an unsigned format (like %hhx for printing an unsigned char as hexadecimal), or use memory view in a debugger

has CLion memory view?

Anonymous

#include<stdio.h> #define my_sizeof(type) (char *)(&type+1)-(char*)(&type) int main() { double x; printf("%ld", my_sizeof(x)); return 0; } Hi, Guys, I am confused about this program, why does it result 8? Thanks in advance

Vitaliy ◀️TriΔng3l▶️

has CLion memory view?

Yes, see Google Images how to access it and display variables in it

Vlad

#include<stdio.h> #define my_sizeof(type) (char *)(&type+1)-(char*)(&type) int main() { double x; printf("%ld", my_sizeof(x)); return 0; } Hi, Guys, I am confused about this program, why does it result 8? Thanks in advance

double occupies 8 bytes

Anonymous

double occupies 8 bytes

I know this, but confused about expression (char *)(&type+1)-(char*)(&type)

Vlad

I know this, but confused about expression (char *)(&type+1)-(char*)(&type)

If you're incrementing pointer to a variable it increments by it's size.

Anonymous

Thanks

Ismael

/ban

Ismael

/add

RAMP

Hi

M__

i am trying to build a game using C and i couldnt seem to find any source for function : delay();

M__

how do i implement delay() using for loop ?

Alex

use sleep

M__

sleep(millisecond) ? whicch header file

Alex

#include <unistd.h> int usleep(useconds_t usec);

Asdew

$ man 3 sleep

V01D

i am trying to build a game using C and i couldnt seem to find any source for function : delay();

Are you using a graphics api like SDL2?

Stefan

how do i implement delay() using for loop ?

you need to find cpu cycle timing firsr

V01D

If so, you might have a sleep function for the API. For SDL2 it is SDL_Delay(time); for example

V01D

you need to find cpu cycle timing firsr

That's a little extreme, no need to reinvent the wheel. (Unless I am missing something, but the whole rdtsc instruction idea seems a bit OP.)

V01D

Has any one worked with audio in C? More specifically in calculating the FFT, and finally the power spectrum of a sample? I am working on this, for an audio visualizer and was wondering if any one has a library they can recommend to work with FFT. (I am thinking about SFML, fftw3, or kiss FFT. (Open for anything new, too))

M__

Are you using a graphics api like SDL2?

I'm Not using graphics library for now Just trying to build snake game

V01D

Ok

M__

If so, you might have a sleep function for the API. For SDL2 it is SDL_Delay(time); for example

I found the function It's usleep( time ) for windows Os

V01D

Ok, cool

Vlad

I found the function It's usleep( time ) for windows Os