But in case of Entity e1("value"); Direct conversion is taking place.....hope I have understood it correctly?

But then: Entity e1= "value";. //Invalid for obvious reasons Entity e2(" value") ; works fine for some reason

read about explicit in costructor

@codingmeme

@codingmeme

😂

why? there is costructor with one argument

from your link: struct Exp { explicit Exp(const char*) {} }; // not convertible from const char* Exp e1("abc"); // OK Exp e2 = "abc"; // Error, copy-initialization does not consider explicit constructor struct Imp { Imp(const char*) {} }; // convertible from const char* Imp i1("abc"); // OK Imp i2 = "abc"; // OK

I see, sorry

he uses const char* instead of string

Yeah that's exactly I was searching for....copy intialization by c style char string while actually passing string type object in constr call. The link clarified the doubt. Appreciated it👍

I think it's more related to the fact that only one implicit conversion is allowed for a value in this case. https://ideone.com/CFAwX8

/ban @Brayannnnnnnnnnn asking for help during test in dms smhmh

/get ide

Can someone help me with the equivalence of "windows.h" library in linux?

i wrote something in C in windows but now in linux, it can't work. Please

what kind of functionality do you need?

Thank you Rose

what const_cast really does?

what const_cast really does?

takes constness away

remove const qualifier

takes constness away

and why it only works for references and pointers?

I think I got it

thanks

compiling with -ftrapv flag aborts the program, how to find the line on which abort is called?

Before debugging, do I still need to compile with the -ftrapv flag?

Thanks so much.

How to get an array of 10^9 or it's not possible ,,if vector then max size of vector??

How to get an array of 10^9 or it's not possible ,,if vector then max size of vector??

type val[1000000000];

or better type *val = malloc(sizeof(type) * 1000000000)

because of stack overflow

use new for c++

Sorry wrong chat

How to get an array of 10^9 or it's not possible ,,if vector then max size of vector??

Thanks ,

#include<iostream> // CODE for spiral print 2d array by SOURAV SINHA using namespace std; int main() { int val=0; // will be used to initialize the array int rl,cl; int arr[1000][1000]; cin>>rl>>cl; for(int row=0;row<rl;row++) { for(int col=0;col<cl;col++) { val++; arr[row][col]=val; cout<<arr[row][col]<<" "; } cout<<endl; } int strow=0,endrow=rl-1,stcol=0,endcol=cl-1; while(strow<=endrow && stcol<=endcol) { //printing start row for(int i=stcol;i<=endcol;i++) cout<<arr[strow][i]<<" "; strow++; //printing last column for(int i=strow;i<=endrow;i++) cout<<arr[i][endcol]<<" "; endcol--; //printing last row in rev if(strow<endrow) for(int i=endcol;i>=stcol;i--) cout<<arr[endrow][i]<<" "; endrow--; //printing first col in rev if(stcol<endcol) for(int i=endrow;i>=strow;i--) cout<<arr[i][stcol]<<" "; stcol++; } }

the above code runs on online compiler but doesn't run on dev c. pls help

How can I connect sqlite in c++ program?

How can I connect sqlite in c++ program?

🍷

How can I connect sqlite in c++ program?

https://github.com/fnc12/sqlite_orm

Hi

Whenever i try to use backdoor by dana_at_cp from github it always shows an error saying "failed to run baksmali on classes.dex r java class files"?

Please help me with this!

#include <stdio.h> #include<stdlib.h> #include<string.h> typedef struct stack { int size; int top; char *s; }stack; void push(stack*,char); void pop(stack *); int isBalance(char []); int isEmpty(stack *); int main() { char exp[20]; scanf("%s",&exp); printf("%d",isBalance(exp)); return 0; } int isBalance(char exp[]) { stack *st; st->size=strlen(exp); st->top=-1; st->s=(char *)malloc(st->size*sizeof(char)); for(int i=0;exp[i];i++) { if(exp[i]=='(') { printf("\n%d",st->top); push(st,'('); } else if(exp[i]==')') { if(isEmpty(&st)) return 0; else pop(&st); } } if(isEmpty) return 1; else return 0; } int isEmpty(stack *st) { if(st->top==-1) return 1; else return 0; } void pop(stack *st) { printf("\n%d",st->top); if(st->top==-1) printf("\nStack underflow"); else { st->top--; } } void push(stack *st,char x) { if(st->top==st->size-1) printf("\nStack Overflow"); else { st->top++; st->s[st->top]=x; } }

Hey guys can you please help me out with , parenthesis problem using stack , i am unable to debugg it , please help me out

Well , i am sorry for that .....i did the required changes but still problem remains the same , there is a problem in push function . As i have initialized st-> top = -1, but st->top stores garbage value when push function is called . Can you please tell me where i am lagging ? And btw i am sorry for silly mistakes , well i am a newbie ...please forgive my mistakes . Thank you !

https://hastebin.com/raw/disowikusa

What i am suppose to do 😭 , i am unable to debugg ?

Thank you , and i am sorry to bother you again and again .

if I created a pointer in the main and created a function to which I pass this pointer and in this function I use the malloc on the past pointer; why must the function have a pointer return type? why isn't it void? when I allocate memory dynamically the change should not be global?

if I created a pointer in the main and created a function to which I pass this pointer and in this function I use the malloc on the past pointer; why must the function have a pointer return type? why isn't it void? when I allocate memory dynamically the change should not be global?

You either return allocated pointer or pass a pointer to pointer as a function parameter

In second variation return type can be anything

so if i pass a pointer to pointer i am not forced to return anything?

Yes

Please find it yourself

and why if i go alone in the pointer does it not act globally?

I dont understand this question

Wym by globally?

when I act on the memory addresses the changes should be global .. I don't understand why if I pass a pointer and act on its addresses they are not global

You mean changes in memory? They are global

Global to your process (application that is) id say

yes this yes, but passing a pointer do not work on its addresses? why these changes are not seen by the main?

Are you talking about assigning something to a pointer variable?

If you have void f(int* a) { a = whatever; } int* b; f(b); only a changes, because a is a copy of b. Changing a does not affect value of b

ok .. so despite passing a pointer, the passage takes place by copy?

ok .. so despite passing a pointer, the passage takes place by copy?

Of course

When one calls it pass by reference, referenceness is implied for memory pointed to, not for variable

Of course

thank you very much.. now everything is clear

When one calls it pass by reference, referenceness is implied for memory pointed to, not for variable

ok ok clear .. thanks

😳

/get cppbookguide

/get ide

I currently use Dev C++ Should I move to Codeblock or any other text editor /IDE ?

I currently use Dev C++ Should I move to Codeblock or any other text editor /IDE ?

Yeah I'd recommend you switch to codeblock or even visual studio if you are using Windows

void rearrange(int *arr,int l) { int temp1,temp2; for(int i=0;i<l;i=i+2){ for(int j=i+1;j<l;j++){ if(arr[i]+arr[j]==0){ temp1=arr[j]; temp2=arr[i+1]; arr[i+1]=temp1; arr[j]=temp2; break; } } } return arr; //Write code here, make changes in the same array }

Compilation Failed In file included from runner.cpp:2:0: solution.h: In function 'void rearrange(int*, int)': solution.h:17:12: error: return-statement with a value, in function returning 'void' [-fpermissive] return arr; ^

Thanks

can anyone pls help me with that

Good morning

Compilation Failed In file included from runner.cpp:2:0: solution.h: In function 'void rearrange(int*, int)': solution.h:17:12: error: return-statement with a value, in function returning 'void' [-fpermissive] return arr; ^

Its clearly saying "return statement with a value in a function returning void "

void rearrange(int *arr,int l) { int temp1,temp2; for(int i=0;i<l;i=i+2){ for(int j=i+1;j<l;j++){ if(arr[i]+arr[j]==0){ temp1=arr[j]; temp2=arr[i+1]; arr[i+1]=temp1; arr[j]=temp2; break; } } } return arr; //Write code here, make changes in the same array }

The function is void which means you can't return anything so you need to change it return type if you need to return something you can manipulate.

@Surdmanofficial thank u

Tanay you're welcome