good evening

Hi How good is C++ for backend programming? Definitely always has something to say But can it replace languages like php? I know the answer is probably no I have no experience in backend programming but I'm curious to know about c++ performance, how problematic are c++ security vulnerabilities?

C++ in the backend its decent

it does not have as much libraries as node.js, probably yeah

but still there's very good ones, like cpprestsdk (casablanca)

i'd use c++ if the backend had to deal with huuuge workloads, where a language based on an interpreter impl, like php or even javascript, wont be enough (note that node.js uses V8, which performs JIT compilation, making it "almost" as fast as a compiled language)

how to debug child process when using vscode

I create a breakpoint at child process ,when I click debug button ,I can't get that

i'd use c++ if the backend had to deal with huuuge workloads, where a language based on an interpreter impl, like php or even javascript, wont be enough (note that node.js uses V8, which performs JIT compilation, making it "almost" as fast as a compiled language)

👍 Thanks for reply

Has anyone solved skyscraper problem before?

#include <bits/stdc++.h> using namespace std; int main() { string s,t; cin>>s>>t; bool x=true; stack<char> st; for(int i=0;i<t.size();i++){ st.push(t[i]); } for(int i=0;i<t.size();i++){ if(s[i] != st.pop()){ x=false; } } if(x == true){ cout<<"YES"<<endl; } else{ cout<<"NO"<<endl; } return 0; } I have to check is both strings s and t are reverse of each other or not. I tried using stack but its giving error

what meaning of this pane

Class attributes call constructor? For example: class MyClass { AnotherClass value; // will call constructor? }

Class attributes call constructor? For example: class MyClass { AnotherClass value; // will call constructor? }

If AnotherClass has a default constructor specified, then it will be called when MyClass is constructed

If AnotherClass has a default constructor specified, then it will be called when MyClass is constructed

can i disable it?

can i disable it?

What do you want to achieve by that?

What do you want to achieve by that?

Oh, maybe I want something wrong

Oh, maybe I want something wrong

Not sure without knowing your problem :) If you want to call a different constructor, you can call in in constructor initializer list of your MyClass constructor, for example

Hello everyone

Hello, guys! I am writing my own console excel engine in C11. There is a moment, when I need to took input like this: margin x 10 It means, that program will set margin(like in CSS) of table to 10 characters. I have some struct table, that has *mx* and *my* fields. If first argument of margin was x, then program need to change t->mx. Otherwise program changes t->my. Here is my function for margin command: void margin(const char * command, table *t){ char* arg1, *arg2; sscanf(command, “margin %s %s”, arg1, arg2); /* processing arguments here */ } So if the first argument equal to "x" then it will change t->mx to arg2: const char *xy = "xy"; char *valid = strchr(xy, *arg1); if (valid == NULL || arg1[1] != '\0') error("invalid syntax"); if (arg1[0] == ‘x’) t->mx = atol(arg2); else t->my = atol(arg2); Cool moment for optimization. It was a small introduction for you to understand where do I found my problem. I decided to not use if else statement, instead I want to use it’s shorter version - ternary operator: ((valid-xy == 0) ? (t->mx) : (t->my)) = atol(arg2); The main question is - why do I get error: main.c:0:0: error: lvalue required as left operand of assignment. I literally don’t understand - if condition equal to zero, it takes t->mx otherwise it takes t->my. So I end up with this: *(&(t->mx) + (valid-xy)) = atol(arg2); Too complicated I think. Then how to fix ternary operator?

Are you the group admin?

Plz send me the indian c/c++ group link so that someone can explain me in hindi

I have questions in complier in c

Hello, guys! I am writing my own console excel engine in C11. There is a moment, when I need to took input like this: margin x 10 It means, that program will set margin(like in CSS) of table to 10 characters. I have some struct table, that has *mx* and *my* fields. If first argument of margin was x, then program need to change t->mx. Otherwise program changes t->my. Here is my function for margin command: void margin(const char * command, table *t){ char* arg1, *arg2; sscanf(command, “margin %s %s”, arg1, arg2); /* processing arguments here */ } So if the first argument equal to "x" then it will change t->mx to arg2: const char *xy = "xy"; char *valid = strchr(xy, *arg1); if (valid == NULL || arg1[1] != '\0') error("invalid syntax"); if (arg1[0] == ‘x’) t->mx = atol(arg2); else t->my = atol(arg2); Cool moment for optimization. It was a small introduction for you to understand where do I found my problem. I decided to not use if else statement, instead I want to use it’s shorter version - ternary operator: ((valid-xy == 0) ? (t->mx) : (t->my)) = atol(arg2); The main question is - why do I get error: main.c:0:0: error: lvalue required as left operand of assignment. I literally don’t understand - if condition equal to zero, it takes t->mx otherwise it takes t->my. So I end up with this: *(&(t->mx) + (valid-xy)) = atol(arg2); Too complicated I think. Then how to fix ternary operator?

In C, the conditional operator is never an lvalue expression unlike in C++ where it can be an lvalue expression. That is why your code doesn't work like the equivalent if else condition.

Are you the group admin?

Admins in C/C++ Programming: - @SilhouetteInDark - @roxifas - @anunaym14 - @K11M1 - @I_Interface - - @QNeko - @Ariana1729 - @OxFFFFFFFF - @ollirz - @neko_code - @frame0x01 Note: These are up-to-date values

@SilhouetteInDark hehe

Hi guys could you please help me with this questions of leet code and help me to identify why I am getting a null pointer exception

leetcode question 2 Add two numbers

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode() : val(0), next(nullptr) {} * ListNode(int x) : val(x), next(nullptr) {} * ListNode(int x, ListNode *next) : val(x), next(next) {} * }; */ class Solution { public: ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) { vector<int> ans; int carry=0; int val=0; if(l1==NULL && l2==NULL) return NULL; else if(l1==NULL) return l2; else if(l2==NULL) return l1; while(l1->next!=NULL || l2->next!=NULL) { val=l1->val+l2->val+carry; if(val>9) { carry=val/10; val=val%10; } ans.push_back(val); l1=l1->next; l2=l2->next; } while(l1!=NULL) { val=l1->val+carry; if(val>9) { carry=val/10; val=val%10; } ans.push_back(val); l1=l1->next; } while(l2!=NULL) { val=l2->val+carry; if(val>9) { carry=val/10; val=val%10; } ans.push_back(l2->val); l2=l2->next; } ListNode* h=new ListNode(); ListNode* t=h; for(int i=0;i<ans.size();i++) { ListNode* temp=new ListNode(); temp->val=ans[i]; t->next=temp; t=t->next; } return h->next; } };

In C, the conditional operator is never an lvalue expression unlike in C++ where it can be an lvalue expression. That is why your code doesn't work like the equivalent if else condition.

Thx! Now I understood

Hi guys, any resource to build desktop applications in c++?

Ok rose thanks

Hi, I have a problem, I hope for your help. How to sum elements in variable c? #include <stdio.h> #include <math.h> int main() { int x, n,i,c,z; scanf("%i", &x); scanf("%i",&n); for(i=1; i<=n; i++){ c=pow((x-1),i); printf("%i",c); } return 0; }

Hi, I have a problem, I hope for your help. How to sum elements in variable c? #include <stdio.h> #include <math.h> int main() { int x, n,i,c,z; scanf("%i", &x); scanf("%i",&n); for(i=1; i<=n; i++){ c=pow((x-1),i); printf("%i",c); } return 0; }

It is impossible or not?

Hi, I have a problem, I hope for your help. How to sum elements in variable c? #include <stdio.h> #include <math.h> int main() { int x, n,i,c,z; scanf("%i", &x); scanf("%i",&n); for(i=1; i<=n; i++){ c=pow((x-1),i); printf("%i",c); } return 0; }

Initialize 'c' to 0 and change c = pow((x - 1), i); to: c += pow((x - 1), i);

1) Write a program that uses the cin method get() to read a line character by character and stores it in a char array. The line is then output in reverse order. Use a pointer, not an index, to address the array elements. Incorporate a class with free store memory allocation for the array of characters that includes a function to reverse the order of the stored character array and print it to the screen and that holds the character array. what is need of using class here i dont understand i know c++ very well but any one can explain what this questions asking for

1) Write a program that uses the cin method get() to read a line character by character and stores it in a char array. The line is then output in reverse order. Use a pointer, not an index, to address the array elements. Incorporate a class with free store memory allocation for the array of characters that includes a function to reverse the order of the stored character array and print it to the screen and that holds the character array. what is need of using class here i dont understand i know c++ very well but any one can explain what this questions asking for

any one please

can i disable it?

You can't. Before construction object does not begin its lifetime

And only possible way to achieve this in the language is to cast raw memory as an object

Needless to say it's UB

Can someone help me ? Idk anything about c programming basics Would someone please tell me what should I do?

Please ?

Can someone help me ? Idk anything about c programming basics Would someone please tell me what should I do?

like if you wan't to learn it, then you probably need to learn it. What problem are you facing?

like if you wan't to learn it, then you probably need to learn it. What problem are you facing?

How can I learn ? Can you please tell ? Any tips ?

I don't no

How can I learn ? Can you please tell ? Any tips ?

well need to imerse yourself with it. So watch some videos/courses or read a book. Then (or while you are doing so) try to write something too

well need to imerse yourself with it. So watch some videos/courses or read a book. Then (or while you are doing so) try to write something too

Can you recommend me some videos for new student ? Very new student idk anything about c programming

Can you recommend me some videos for new student ? Very new student idk anything about c programming

Please sir please

like if you wan't to learn it, then you probably need to learn it. What problem are you facing?

yeah😂😂😂

Can you recommend me some videos for new student ? Very new student idk anything about c programming

tbh... i cannot. Bisqwit has some nice topics but they are already advanced

You can't. Before construction object does not begin its lifetime

Okey, if i use int like attribute and dont init it in class constructor, its will be 0 or UB?

Okey, if i use int like attribute and dont init it in class constructor, its will be 0 or UB?

It will be uninitialized. Because default constructor of int is a noop

Reading uninitialized memory is UB yes

Hello guys,,,,I'm Sammy...a beginner..any volunteer to take me through c programming

Initialize 'c' to 0 and change c = pow((x - 1), i); to: c += pow((x - 1), i);

Thank you very much

Initialize 'c' to 0 and change c = pow((x - 1), i); to: c += pow((x - 1), i);

😭

Hey, can I send my code here? I have segmentation fault and I don't understand why

Use pastebin

Hey, can I send my code here? I have segmentation fault and I don't understand why

the rules say you can always send code if you upload it to a pastebin

or any snippets website

to be honest im pretty new to c, doing a course in the university, any tips to improve my code will be happily accepted https://pastebin.com/TeF9rjxL

I do not know why all over the internet Python is considered an angel and C ++ is a nightmare and a useless language. These words are funny, but on the other hand, they torment me

to be honest im pretty new to c, doing a course in the university, any tips to improve my code will be happily accepted https://pastebin.com/TeF9rjxL

Accept the dimensions first and create two arrays of that size using dynamic memory allocation. In your code if I give 2 inputs for vector u and vector v and then specify dimensions as 3, your code would fail. Don't use gets for array inputs. Once you know the dimensions, iterate over the array and populate it. Gets is a deprecated function and should not be used. It is unsafe.

😭

?

I do not know why all over the internet Python is considered an angel and C ++ is a nightmare and a useless language. These words are funny, but on the other hand, they torment me

People who use only C/C++ don't know the advantages Python offers and end up dissing it. People who use only Python have no idea about C/C++ and end up dissing it. And then there are the rest of us who use both the languages and know what the advantages and disadvantages with each are and know when to use what. Python has a unparalleled library support and no other language barring .NET platform languages come close.

People who use only C/C++ don't know the advantages Python offers and end up dissing it. People who use only Python have no idea about C/C++ and end up dissing it. And then there are the rest of us who use both the languages and know what the advantages and disadvantages with each are and know when to use what. Python has a unparalleled library support and no other language barring .NET platform languages come close.

Can you make a small comparison for me?

People who use only C/C++ don't know the advantages Python offers and end up dissing it. People who use only Python have no idea about C/C++ and end up dissing it. And then there are the rest of us who use both the languages and know what the advantages and disadvantages with each are and know when to use what. Python has a unparalleled library support and no other language barring .NET platform languages come close.

I use both and the only thing I dislike about Python is the syntax

nonetheless, C/++ and Python are both tools and they have best use cases

I have no prejudice against any language Each language has its own audience and goals But it is wrong to call this language a nightmare

it's fair to call any language a nightmare

even python, more specifically django

there's stuff that just doesnt make sense

and python is a "simple language," but that only applies to the syntax

I can not communicate well with script languages ​​because I have been working on C ++ since day one

with c++, i had many moments where i wanted to quit and i still use it because its a tool

I can not communicate well with script languages ​​because I have been working on C ++ since day one

i started in interpreters

specifically, with batch and au3

then i went with C# which is theoretically compiled

to its own bytecode just like Java does

and then i went to many other programming languages until i ended up with C++ and C

then i went with C# which is theoretically compiled

I feel the C ++ is still long-lived