thanks

[Qurbanli]

i want to input integers till push enter,please help me.

[ciphermagi]

I can definitely help you with that.

int i;
cin >> i;

As soon as you push enter, it'll take your integers.

[ciphermagi]

Actually, this brings up a question I have. Is it possible to read a stream of integers separated by white space with:

vector<int> i;
vector<int>::iterator it;

vectori.push_back(cin);

[Qurbanli]

i have never seen any code like this
one more thing i want to input a set of integers,but i don't know quantity of them,however i need it becuse i have to find maximum integer among them with for loop

[ciphermagi]

Set a sentinel. This is basically a certain value that would not be used under normal circumstances that you can use as a reference to make a loop terminate. If you're expecting only positive integers, for instance, you could use '-1' and when the user enters -1, the loop will terminate.

Make a loop to keep taking integers and reading them into a vector, list or deque, and then make it terminate the loop and continue on to finding the largest among them whenever the sentinel is entered.

[moorecm]

You might want to check this out:

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
using namespace std;
//...
vector< int > i;
copy( istream_iterator< int >( cin ),
      istream_iterator< int >(),
      back_inserter( i ) );

Some time long ago, one of the members here was all about stream iterators:
http://www.cplusplus.com/forum/general/7385/

[ciphermagi]

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>

using namespace std;

int main(){
    vector<int> i;
    //vector<int>::iterator it;

    cout << "Enter a string of integers separated by a space:" << endl;
    copy(istream_iterator<int>(cin), istream_iterator<int>(), back_inserter(i));
    //for(it = i.begin(); it != i.end(); it++)
    for(int j = 0; j < sizeof(i); j++)
        cout << i[j];
    return 0;
}

Compiled, but freezes.

I'm thinking it doesn't know how to stop taking in ints.

[Qurbanli]

i am very thankful,but i don't understand these,sorry thanks.

[Cuddlebuddie928]

Try one of these... I'm not near a compiler, so I can't test them for sure.

Option #1

#include <iostream>
#include <vector>
using namespace std;

int main()
{
	char ch;
	int i;
	vector<int> ints;

	while(cin.get(ch)) { //pull out one character--doesn't skip whitespace (that's ok)

		//put a numeric character back and read the entire integer
		if(isdigit(ch)) {
			cin.unget();
			cin >> i;
			ints.push_back(i);
		}

		else if(ch=='\n') break; //should exit if the user hits ENTER??
		//otherwise, the character is "eaten"
	}

	//do whatever

	return 0;
}

Option #2

//option 2
#include <iostream>
#include <sstream>
#include <vector>
using namespace std;

int main()
{
	string s;
	int i;
	vector<int> ints;

	getline(cin, s, '\n'); //gets input until user hits enter
	stringstream ss(s); //copies entered input into a new stream

	while (ss >> i) ints.push_back(i); //when you run out of characters, this will terminate :)

	//do whatever

	return 0;
}

[ciphermagi]

I didn't look at option 1, but option 2 returns successful results. I like sstream a lot better than char operations.

[ciphermagi]

So, Qurbanli, I think this is what you were looking for:

#include <iostream>
#include <sstream>
#include <vector>

using namespace std;

int main(){
    string s;
    int i;
    vector<int> ints;
    vector<int>::iterator it;

    cout << "Enter a string of integers separated by a space:" << endl;
    getline(cin, s, '\n');
    stringstream ss(s);

    while(ss >> i) ints.push_back(i);

    for(it = ints.begin(); it != ints.end(); it++)
        cout << *it << endl;
    return 0;
}

[moorecm]

Compiled, but freezes.

I'm thinking it doesn't know how to stop taking in ints.

Streams are terminated with EOF. Try ctrl-d.