but learning high level programming languages such as Java/Python/C++ as the first programming language has drawbacks - that you dont get to learn how things work behind the scenes. For example, what if i ask you to implement thread pool by yourself from scratch. Thats the reason one must start with C before attempting C++. High-level languages abstract the inner concepts.

I mean don't c and c++ also abstracts some concepts that should be known when writing code in assembly? Does that mean one should learn assembly before c?

Please which book

#include <iostream> #include <string> using namespace std; class Cell_user{ protected: string user; int talkTime; public: Cell_user(string name, int time) : user(name), talkTime(time) {} int getTalkTime(){ return talkTime; } virtual void printBill() = 0; void talk(int time){ if(talkTime - time > 0){ talkTime -= time; } else{ talkTime = 0; } } }; class Postpaid: public Cell_user { public: Postpaid(string name, int time) :Cell_user(name, time) {} void printBill(){ //assuming the free fixed talktime is 30 float bill = 0; cout<<"Name: "<<user<<endl; if(talkTime > 30){ bill = (talkTime - 30) * 2.90; } cout<<"Type: Postpaid\n"; cout<<"Talktime: "<<talkTime<<endl; cout<<"Bill: "<<bill<<endl; } }; class Prepaid: public Cell_user { Prepaid(string name, int time) : Cell_user(name, time) {} }; int main(){ Postpaid Khaleed("Khaleed", 60); Khaleed.talk(2); cout<<"Time left: "<<Khaleed.getTalkTime()<<"\n\n"; Khaleed.printBill(); return O; }

You are returning O, you should return 0 (zero).

void freeNodes(struct node *n) { struct node *temp; while(n != NULL) { temp = n; free(temp); n = n -> next; } free(temp); } Error : free(): double free detected in tcache 2 [1] 32680 abort (core dumped) ./new Am I getting this error because I have already freed temp ?

void freeNodes(struct node *n) { struct node *temp; while(n != NULL) { temp = n; free(temp); n = n -> next; } free(temp); } Error : free(): double free detected in tcache 2 [1] 32680 abort (core dumped) ./new Am I getting this error because I have already freed temp ?

void freeNodes(struct node *n) { struct node *temp; while(n != NULL) { temp = n; free(temp); n = n -> next; } free(temp); } Error : free(): double free detected in tcache 2 [1] 32680 abort (core dumped) ./new Am I getting this error because I have already freed temp ?

Idk about C too much But it says that Btw why you have freed temp after while?

thank you..

You're welcome

I want to also ask one thing.. Do i actually have to free memory manually, or the OS will take care of it, when the program ends ?

It's true that the memory will be freed when the programs ends But you have to free memory after you are done with that allocated memory Imagine you have allocated megabytes of memory If you don't delete that memory Your app will have a huge memory space for nothing

What do you think about zombie child processes ? Does freeing memory manually works ?

I want to also ask one thing.. Do i actually have to free memory manually, or the OS will take care of it, when the program ends ?

I want to also ask one thing.. Do i actually have to free memory manually, or the OS will take care of it, when the program ends ?

I want to also ask one thing.. Do i actually have to free memory manually, or the OS will take care of it, when the program ends ?

In C++ there's no garbage collection so you have to manually free the memory when you are working in complex games and web apps. But in languages such as java , there's no need of it as system takes care all of it with predefined classes and also with Something known as Dynamic dispatch.

OS will take care of it when the program ends. This is practical for small programs. But some programs run for a long time, and some programs never even end, like those running on servers and stuff. There a memory leak can cause a ton of trouble.

I think I understand vaguely why i have to free memory manually .. It makes sense when I think about large games that have multiple maps.. where you don't want to load the whole game, but just parts of games whenever needed accordingly inside the same memory limit..

Same..Try Deploying a app in Android studio through CPP and then with Java ..You will immediately get the difference then,

but learning high level programming languages such as Java/Python/C++ as the first programming language has drawbacks - that you dont get to learn how things work behind the scenes. For example, what if i ask you to implement thread pool by yourself from scratch. Thats the reason one must start with C before attempting C++. High-level languages abstract the inner concepts.

but learning high level programming languages such as Java/Python/C++ as the first programming language has drawbacks - that you dont get to learn how things work behind the scenes. For example, what if i ask you to implement thread pool by yourself from scratch. Thats the reason one must start with C before attempting C++. High-level languages abstract the inner concepts.

Hi I'm searching for project ideas dealing with OOP . Can anyone suggest me one?

Hi I'm searching for project ideas dealing with OOP . Can anyone suggest me one?

but learning high level programming languages such as Java/Python/C++ as the first programming language has drawbacks - that you dont get to learn how things work behind the scenes. For example, what if i ask you to implement thread pool by yourself from scratch. Thats the reason one must start with C before attempting C++. High-level languages abstract the inner concepts.

Start from electrons and build your way up :D

Start from electrons and build your way up :D

I don't understand what (×+=j-1) function does

It means x = x + (j-1)

However, it does not find occurencies

What's wrong with this code? #include <iostream> using namespace std; int limitNumber; int sum=limitNumber;; int sumValue() void adding_a_series(int no) { if(no!=0) { sum=no+sum; adding_a_series(no-1); } } int main() { cout<<"Enter a limit number : "; cin>>limitNumber; adding_a_series(limitNumber); cout<<"sum= "<<sum<<endl; return 0; }

can i share the link of the question

If you wanna get banned, sure.

why ?

Hello where I can learn c++ and apply on hardware.?

Read the rules...

Hi bro I suggest you to read books That's really better than any other way to learn a new language Btw if you are tired of books, you can use faradars.org (not free but it teaches good) or as others said YouTube.com (if you have no problem with En)

We don't do home work, class work, certification tests, prize challenges, etc. People here are at their leisure to help you learn, not for you to profit off us.

I had a single book, which was called https://www.cprogramming.com/books/ritchie.html

i am unable to optimize my code ..if some one can help or give a method to optimize it ..plz tell

How stupid sounds an idea to restrict ability to call specific functions by requiring an object as an argument that has no members, has private constructors, and has friend classes that can create this object, and you can't get these objects outside of some specific contexts (unless doing something very ugly)?

How to lower case a string without tolower function

Neha wants to distribute packs of biscuits (Rs. 10 each) and some chocolates (Rs. 5 each) to nearby children living in her locality on her birthday. She has a total budget of Rs. N and she is allowed to buy at most X biscuits and Y chocolates. Calculate if she will be able to give all C numbers of children something under her budget.If so, print YES or else print NO for each testcases. Note - Child should get either one chocolate or one pack of biscuit.

We don't solve other's exams here.

it is not a exam problem its a book problem

Do you mean embedded systems?

Yes

You could use Arduino to learn about programming the hardware, it is best for new user.

Can someone assist me with codes for Date validation and include leap years

You could use Arduino to learn about programming the hardware, it is best for new user.