please solution this program,

class A { public: A() { try { b = new B(); } catch (std::bad_alloc) { cerr << "Couldn't create b.\n"; } }; ~A(); }; class B { public: B() { try { c = new C(); throw(bad_alloc()); } catch (std::bad_alloc) { cerr << "Couldn't create c.\n"; throw(std::bad_alloc()); } }; ~B(); C *c; }; int main() { A *a = new A(); return 0; };

<stdin>:5:17: error: use of undeclared identifier 'b' b = new B(); ^ <stdin>:5:25: error: unknown type name 'B' b = new B(); ^ <stdin>:6:22: error: use of undeclared identifier 'std' } catch (std::bad_alloc) { ^ <stdin>:7:17: error: use of undeclared identifier 'cerr' cerr << "Couldn't create b.\n"; ^ <stdin>:25:9: error: unknown type name 'C' C *c; ^ <stdin>:17:25: error: unknown type name 'C' c = new C(); ^ <stdin>:18:23: error: use of undeclared identifier 'bad_alloc' throw(bad_alloc()); ^ <stdin>:19:22: error: use of undeclared identifier 'std' } catch (std::bad_alloc) { ^ <stdin>:20:17: error: use of undeclared identifier 'cerr' cerr << "Couldn't create c.\n"; ^ <stdin>:21:23: error: use of undeclared identifier 'std' throw(std::bad_alloc()); ^ <stdin>:29:8: warning: unused variable 'a' [-Wunused-variable] A *a = new A(); ^ 1 warning and 10 errors generated.

I think his message was pseudocode

from numba import jit, cuda import numpy as np # to measure exec time from timeit import default_timer as timer # normal function to run on cpu def func(a): for i in range(10000000): a[i]+= 1 # function optimized to run on gpu @jit(target ="cuda") def func2(a): for i in range(10000000): a[i]+= 1 if name=="__main__": n = 10000000 a = np.ones(n, dtype = np.float64) b = np.ones(n, dtype = np.float32) start = timer() func(a) print("without GPU:", timer()-start) start = timer() func2(a) print("with GPU:", timer()-start)

Hey how to check if there's any space between string or not ?

Just for reference

Just for reference

I wanna learn c++ from beginning

The best way to learn C as a first language is through a book as your first language is the hardest language

cmd used to compile: "cl /nologo /c /O1 test.cpp" -> "link /nologo /ENTRY:main /SUBSYSTEM:WINDOWS test.obj msvcrt.lib kernel32.lib user32.lib"

/get

Use msvc

cli is but its hard to use cli on msvc its hell even trying to find where its located

Should be in PATH and if not, it's added in the development console. Doesn't matter, so what you tried to say was "use msvs" not "use msvc".

It's most likely in path automatically if you installed visual studio community 2019

I'm not really sure if there are anyways to get MSVC compiler besides Visual Studio Community

DOS commands are hard to use for me

#include<iostream> #include<stdlib.h> using namespace std; struct node { int data; struct node *next; }*first; void create(int a[],int size) { int i=0; struct node *t,*last; first=new node; first->data=a[i]; first->next=NULL; last=first; for(i=1;i<size;i++) { t=new node; t->data=a[i]; t->next=NULL; last->next=t; last=t; } } void Display(struct node *t) { while(t) { cout<<t->data<<" "; t=t->next; } } int count(struct node *p) { int count=0; while(p) { count++; p=p->next; } } void Insert(struct node *p,int position,int x) { struct node *t=new node; t->data=x; if(position<0||position>count(p))return; if(position==0) { t->next=first; first=t; } else { for(int i=0;i<position-1;i++)p=p->next; t->next=p->next; p->next=t; } } int main() { int a[]={1,9,3,7,6,4,5,2,8}; create(a,9); Display(first); cout<<endl; Insert(first,5,100); Display(first); cout<<endl; return 0; }

#include<iostream> #include<stdlib.h> using namespace std; struct node { int data; struct node *next; }*first; void create(int a[],int size) { int i=0; struct node *t,*last; first=new node; first->data=a[i]; first->next=NULL; last=first; for(i=1;i<size;i++) { t=new node; t->data=a[i]; t->next=NULL; last->next=t; last=t; } } void Display(struct node *t) { while(t) { cout<<t->data<<" "; t=t->next; } } int count(struct node *p) { int count=0; while(p) { count++; p=p->next; } } void Insert(struct node *p,int position,int x) { struct node *t=new node; t->data=x; if(position<0||position>count(p))return; if(position==0) { t->next=first; first=t; } else { for(int i=0;i<position-1;i++)p=p->next; t->next=p->next; p->next=t; } } int main() { int a[]={1,9,3,7,6,4,5,2,8}; create(a,9); Display(first); cout<<endl; Insert(first,5,100); Display(first); cout<<endl; return 0; }

Also I read somewhere, you should use nullptr instead of NULL for pointers

What's the difference? I have been using NULL everywhere in my c++ code never used nullptr

I dont remember why, but it's something with the cpp stdlib

I think using both is fine

I think using both is fine