C++ Help for Array

[msapumal]

Can anybody please tell me, How to declare a array for following variable using C++

#Dont know size of the array
#Dont know the values which input i to arrays

//Marks is the array name
//count is array size
// x is input value by user
Example- int Marks[count]={x}

I want a simple solution

 

[danu91]

int count = 1000000;
int arr [count];
cin >> count;
for (int x=0; x <= count ; x++){
arr;
}

 

[danu91]

or you can use a vector.. but i dont know whether C++ have vectors... in java and c# you can easily use a vector for ur prob!

www.cplusplus.com
refer this website!!

 

[msapumal]

count = 1000000

is this type of variable declaration is a good programming behavioral?
I mean, is this valid for professional programming?

 

[¤--bACarDi--¤]

if you don't know the size of the array, they you should go with dynamic memory allocation,


int *marks = new int [COUNT];

 

[danu91]

he's asking for a simple solution right??
soo, i guess da simplest way is dat, although ur solution is theoretically better than mine

 

[msapumal]

Thank you pal,
Can you please simply explain me about dynamic memory allocation.
I'm new to C++ programming and I have a course work to do...

 

[danu91]

Thank you pal,
Can you please simply explain me about dynamic memory allocation.
I'm new to C++ programming and I have a course work to do...

machan refer www.cplusplus.com
i think its da best for C++

 

[danu91]

count = 1000000

is this type of variable declaration is a good programming behavioral?
I mean, is this valid for professional programming?

professional method is to use pointers. but it depends on how much u have learned and how much u are willing to learn!!
btw, are u from iit?

 

[msapumal]

Yeah!
How did u knw?

 

[danu91]

Yeah!
How did u knw?

hahahah.. apith oya katta kawa ban//// pointers igannuwe 1st year eke anthima kaale.. ethakan api int count = 10000000; daala thamai course work kaleh.. btw, im 2nd year ryt now!!

 

[danu91]

ow ban... mama iit eke 2nd year eke

 

[msapumal]

he he....
then is it ok 2 use that sort of declaration for this CW?
I mean, is it not a problm for Mr. Dulip?

btw nice meet u ....

 

[danu91]

he he....
then is it ok 2 use that sort of declaration for this CW?
I mean, is it not a problm for Mr. Dulip?

btw nice meet u ....

nice 2 meet u 2 machan....
anyway, dulip didnt teach us.. it was Ishara akka hu taught us!.. but, if dulip hasn't taught u pointers, then u are allowed 2 create a big enough counter variable and use it.. if u want, juz send him a email and see.. anyway, we used bigger enough counter variables in our 1st year cw!

 

[msapumal]

nice 2 meet u 2 machan....
anyway, dulip didnt teach us.. it was Ishara akka hu taught us!.. but, if dulip hasn't taught u pointers, then u are allowed 2 create a big enough counter variable and use it.. if u want, juz send him a email and see.. anyway, we used bigger enough counter variables in our 1st year cw!

Thanx a lot..

 

[¤--bACarDi--¤]

dynamic memory allocation means that you are taking memory from Heap
new in c++ or malloc in C will give you memory from the heap.

so when you don't know the size you'll need, go with it

 

[rokie]

yeah Dynamic Array initializing is the most safest way to your question

but your second condition has a problem
it is that
you've told that u don't know which values you've going to input

in concept of initializing arrays you must know which types of values that u going to enter to your array that means the type (int ,String ,unint, binary etc)-- i am Not a professional in c++ but I've qualified in J2SE platform very much.

I don't think that there are much more variations in java and c++ either.......
But initializing variables which u don't know where it is situated in the nameSpace won't be a good thing in programing ....
don't worry u'll learn eventually.......... the types of variables

in your case initializing the 'count' variable is must it is a good behavior that you've assigned a very big number to it............

imagine that you've entered a length of 1000001 values into the array
what else can u do ??????????????????

 

[Dead Island]

what's the point of C++ if u don't use STL classes?
so use Vector or List. if u use C stick to Arrays.
if the language has inbuilt features use them that's why they are for.

 

[thila22]

create dynamic array
i think u already know

SIMPLE

 

[slreverersetuts]

simply u can use vector with STL.but it is not a part of pure c++ it is a pre written code for that can use for sizable arrays.also u can do with pure c++ with dianamic memory allocations and pointers.the simple idea is if the size is not enough create a array that have previous array's size+1 size and copy all the array in to the newly created array.and ready to get new input.the code get some loops and functions.OR simply u can write...

#include <iostream>
usning namespace std;
int main ()
{
int count = 0;
cout << "enter the size of array : ";
cin >> count;
int array[count];
for (int i = 0; i < count; ++i)
{
cout << "enter a value to insert to the array : ";
cin >> array;
cout << "inserted to the array !"<<endl;
}
return 0;
}