Taking the sum of values from a stream : istream iterator « STL Algorithms Iterator « C++ Tutorial

1.	Language Basics
2.	Data Types
3.	Operators statements
4.	Array
5.	Development
6.	Exceptions
7.	Function
8.	Structure
9.	Class
10.	Operator Overloading
11.	Pointer
12.	File Stream
13.	template
14.	STL Introduction
15.	string
16.	vector
17.	list
18.	bitset
19.	set multiset
20.	valarray
21.	queue stack
22.	deque
23.	map multimap
24.	STL Algorithms Modifying sequence operations
25.	STL Algorithms Non modifying sequence operations
26.	STL Algorithms Binary search
27.	STL Algorithms Sorting
28.	STL Algorithms Merge
29.	STL Algorithms Min Max
30.	STL Algorithms Iterator
31.	STL Algorithms Heap
32.	STL Algorithms Helper

C / ANSI-C

C Tutorial

C++

Visual C++ .NET

C++ Tutorial » STL Algorithms Iterator » istream iterator

30.5.1.Taking the sum of values from a stream

#include <iostream>

#include <iterator>

using std::cout;

using std::endl;

using std::cin;

using std::istream_iterator;



template <typename Iter> 



double mySum (Iter begin, Iter end) { 

  double sum = 0.0;

  

  for( ; begin != end ;)

    sum += *begin++;

  return sum;

} 



int main() {

  cout << "Ctrl-Z to stop" << endl;



  double av = mySum(istream_iterator<double>(cin), istream_iterator<double>());



  cout << "The sum value is " << av << endl;

return 0;

}

Ctrl-Z to stop
^Z
The sum value is 0

30.5.istream iterator
	30.5.1.	Taking the sum of values from a stream
	30.5.2.	Use istream_iterator to loop through a string
	30.5.3.	Use istream_iterator to loop through a string defined by char pointer
	30.5.4.	Read words from standard input, sort and print out without duplicates
	30.5.5.	Read string from keyboard and save to vector directly
	30.5.6.	istream_iterator reads and displays characters from cin until a period is received.
	30.5.7.	Advance istream_iterator

www.java2java.com | Contact Us

All other trademarks are property of their respective owners.