string storeContact(){ String contactName; cout << " Enter contact name "; getline (cin, contactName); cout << contactName << endl; return contactName; }

line 2: use 'string' keyword , in small case

in c++ if there is a condition like this if (0<x<10){ cout<<"true";} Then what does this condition is checking. Is it marks is greater than 25 and less than 45 or it means? marks is greater than 25 or less than 45 According to me it should follow the and one but when i run the program give x a number more than 45 it prints true

in c++ if there is a condition like this if (0<x<10){ cout<<"true";} Then what does this condition is checking. Is it marks is greater than 25 and less than 45 or it means? marks is greater than 25 or less than 45 According to me it should follow the and one but when i run the program give x a number more than 45 it prints true

What does it mean when the Betty linter throws a warning that says no description found for function main?

What does it mean when the Betty linter throws a warning that says no description found for function main?

I'm running through some CUDA examples: sumCommMultiBlock<<<1, blockSize>>>(dev_out, gridSize, dev_out); cudaDeviceSynchronize(); cudaMemcpy(&out, dev_out, sizeof(int), cudaMemcpyDeviceToHost); Is cudaDeviceSynchronize() actually needed there? Doesn't the flow of the program wait for all the threads of the kernel to be finished?

No it is not needed here. Here the memcopy waits for sumCommMultiBlock kernel to finish and only then copies the memory. The CPU is blocked till then. You don't need a cudaDeviceSynchronize call here.

🤔 but any other CPU thing could be happening between the kernel and the cudaMemcpy?

https://stackoverflow.com/questions/72505202/warning-no-description-found-for-function-main

No, there is not any other instructions in the example, but my second question was about "what if there were..."

io/ssd speed

I'm not sure but I would guess it compares 0 and x, and if x is greater than 0 it compares 1 (bool converted to int) with 10, so if 1 less than 10 then the condition is true. If x is not greater than 0, then it compares 0 with 10. So it's something like this in the end if ((0 < x) < 10) So the condition will always return true

int sum,n; cout<<sum<<endl; cin>>n; return 0; This program is giving random outputs for line 2 but if i comment out line3 it is working fine(giving output 0) WHY? The values it is returning is 32765/32766/32767

c = ((c + 10) % 122) + 96;

c = ((c + 10) % 122) + 96;

You can download Visual Studio Community Edition (not Visual Studio Code, that's a different thing), find some tutorials how to use it, and set it up with C++ components. This should be enough to start. Tutorials are important because it's not user-friendly at the beginning, difficult to find where is what.

Hi again, I have been having trouble setting up visual studio, is there an alternative software I can make use of

your printf are missing the 2nd argument to fill %d

It's depend on where the variable located. Because you didn't assign a value to sum, value of sum remain the value which on the place allocated to sum.

So is it a good practice to assign a value to variable as soon as I create it?

It also depends on the use of your variable

What do you mean?

What do you mean?

I mean, for example if you will use your variable in the future eg in a for loop. Since the variable will be really involved and you won’t want it’s address value to temper with your evaluations. So better assign it a value.

just keep in mind that if you declare variable without assignment it can store garbage (previous memory state). Assignment operations costs computation time so in C/C++ usually you won't pay for something which you don't use explicitly.

So is there anything like None or Null value in c++? That I can assign to it?

just use zero (or nullptr for pointers)

Can anyone suggest me which online compiler will be best for practicing C?

Can anyone suggest me which online compiler will be best for practicing C?

Onlinegdb its not complex as godbolt

#include<stdio.h> struct node { int data; struct node* next;   struct node* prev; }; int main() { struct node* ptr1=(struct node*)malloc(sizeof(struct node)); struct node* ptr2=(struct node*)malloc(sizeof(struct node)); struct node* ptr3=(struct node*)malloc(sizeof(struct node)); ptr1->data=10; ptr2->data=20; ptr3->data=30; ptr1->next=ptr2; ptr2->next=ptr3; ptr3->next=NULL;   ptr3->prev=ptr2; struct node* ptr=ptr1; while(ptr!=NULL) { printf("%d\t",ptr->data); ptr=ptr->next; if(ptr==ptr3) { ptr=ptr->prev; } } } The output of this code is: 10 20 20 20 20 20... But I wanted to change my code so as to have this as output: 10 20 20 30 but I don't know how I can!!! and I don't want just to type what I want using printf, cause I'd rather using loop

C++ version — https://godbolt.org/z/c53TaPhGd C version — https://godbolt.org/z/cd4WrbGzK

So is it a good practice to assign a value to variable as soon as I create it?

On the contrary, it is a good practice to create new variables close to the place where you need them. That way you will know what a good initial value is.

Hey! Can anyone tell how to print all prime nos till n Pls tell the most short and precise code!

c = ((c + 10) % 122) + 96;

Hey! Can anyone tell how to print all prime nos till n Pls tell the most short and precise code!

https://dpaste.org/VMS28

https://dpaste.org/VMS28

You have written for the number of prime numbers under the range, nd moreover you can optimise it by j<=i/2

You have written for the number of prime numbers under the range, nd moreover you can optimise it by j<=i/2