Off-Topic: Do you guys suggest any good database software? I want to connect a software I'm creating un C++ to it.

Off-Topic: Do you guys suggest any good database software? I want to connect a software I'm creating un C++ to it.

go to OT group

Thanks 👍

in my system, all the numbers are valid. i just wanna make char invalid

im using this

https://en.wikipedia.org/wiki/Type_conversion I suggest you read this if you want to understand more

https://en.wikipedia.org/wiki/Type_conversion I suggest you read this if you want to understand more

thanks

but what if the user enter character

https://godbolt.org/z/3GxGcG

in my system, all the numbers are valid. i just wanna make char invalid

Can't you read it as string and check with the method "isdigit on characters?

in my system, all the numbers are valid. i just wanna make char invalid

char is a number that encodes a symbol

it’s 4 bytes like int

so you need to banned all 4bytes

all from 0 to 2^32-1 numbers 🙂

so you need to banned all 4bytes

Lol wtf

This troller coaster got too far

This troller coaster got too far

this is what he wants Lmao

in my system, all the numbers are valid. i just wanna make char invalid

*

this is what he wants Lmao

This is a group with some people having subpar english

So don't take it super seriously

This is a group with some people having subpar english

daddy chill

So don't take it super seriously

😉

daddy chill

Have you seen my solution?

Have you seen my solution?

yeah

youre helping mate

thank you

im using this

scanf('%d',&var); if ((var<0)ll(var>9)) { ...printf("%s","error")...}

/get cbook

/get cppbookguide

/get ide

Ok no promo again , /sorry

/sorry

/sorry

main() { unsigned x=1; signed char y=-1; if(x>y) printf("x>y"); else printf("x<=y"); } OP x<=y Why is the op x<=y...?

main() { unsigned x=1; signed char y=-1; if(x>y) printf("x>y"); else printf("x<=y"); } OP x<=y Why is the op x<=y...?

It doesn't matter

It was a 1 mark question in my class test😂

Anyone know about coding?

Anyone know about coding?

No one

👍

main() { unsigned x=1; signed char y=-1; if(x>y) printf("x>y"); else printf("x<=y"); } OP x<=y Why is the op x<=y...?

Try to think

No one

😂

Try to think

Okay

P

hi guys, i want to improve the efficiency of my program when i convert from uppercase to lowercase, does anyone know how?

hi guys, i want to improve the efficiency of my program when i convert from uppercase to lowercase, does anyone know how?

How exactly do you do it?

Because converting to lowercase is quite cheap. You just substract 32 I believe from each character

Because converting to lowercase is quite cheap. You just substract 32 I believe from each character

yes, i did that

but i must improve efficiency, this function is part of a larger program(a Tokenizer)

but i must improve efficiency, this function is part of a larger program(a Tokenizer)

I guess you can try to substract the whole word at once

And maybe if you're so tight on efficiency look up simd instructions and code it in assembly

i do: str [i] -= 32;

And maybe if you're so tight on efficiency look up simd instructions and code it in assembly

okay, ty

i do: str [i] -= 32;

That's only one byte at the time

one friend talked me about branchless programing to improve efficiency

one friend talked me about branchless programing to improve efficiency

There's no branching in your code

yeah yeah, i know

But you may unfold a loop

Do you know if it would be a good idea to implement it?

But it's likely already done by your compiler

But you may unfold a loop

Isn't that actually worse for performance by today's standards?

"On modern processors, loop unrolling is often counterproductive, as the increased code size can cause more cache misses" -- https://en.wikipedia.org/wiki/Loop_unrolling

If this is wrong, though, please do tell me 😅

Isn't that actually worse for performance by today's standards?

In such cases you don't take guesses you test

Especially if he claims that his performance is really tight

In such cases you don't take guesses you test

Ah, of course, that's true

Hello, Tell me who knows on which English-language boards of announcements I can sell my e-commerce website (blog/online store on Wordpress)? Thank you

I have to use c++98 for application i am developing for, [EDIT2] i want to control the behavior of constructor based on a static member of class, (in my case a boolean) i want to control the behavior of constructor based on if it is a first ever call to constructor or not. For first ever constructor call, i want to execute some extra code but it must not execute in consecutive calls, For this i decided to have a static bool that will have default value of false, and after first constructor call, it will be set true for every other call. class data_sender { private: static bool library_initialized; public: // etc. }; This is kept private because i dont want consumer of this class to manipulate this directly. Its not const because obviously i want to change it inside constructor. Now i cannot assign the default value for this, it says c++ forbids this non-const static variable initialization. I think my approach is wrong here and i should be using some other method. I am relatively new to c++ so even if you point me to some article or tell me what to search for this. [EDIT] Another strange thing i noticed is, when i define the library_initialized as false within the .h file, class data_sender { .... }; bool data_sender::library_initialized = false; it gives me linker error. But if i define it inside the data_sender.cpp, it allows me to do this, bool data_sender::library_initialized = false; // This is inside data_sender.cpp

I'm getting error that unable open include file 'IOSTRAM' in turbo c7 by akki... How do i solve this.!! I want to code a program in c++

I'm getting error that unable open include file 'IOSTRAM' in turbo c7 by akki... How do i solve this.!! I want to code a program in c++

Turbo C is shit

Delete it

Turbo C is shit

Yeah 😣

Delete it

So where to code !!

Agreed, if you really want to learn c++, windows - go for visual c++ or mingw linux - gcc/clang

Agreed, if you really want to learn c++, windows - go for visual c++ or mingw linux - gcc/clang

Ohk ... thanks 😊

Ohk ... thanks 😊

Most probably someone at school or university taught you in turbo cpp. If possible convince them to allow you to use proper compiler instead of turbo c++.

Most probably someone at school or university taught you in turbo cpp. If possible convince them to allow you to use proper compiler instead of turbo c++.

Yes that's a big problem

But in visual studio code setting up all things for c++ is some what difficult

So how do i configure 😅

But in visual studio code setting up all things for c++ is some what difficult

Not really

Just fire the installer and select C++ Development workloads

Then boot up visual studio itself and click on new project, C++ project, and u good

Ah wait, my bad, you said vscode 😅