ex02-15-accumulate-riterator.cpp

#include<iostream>
#include<vector>
#include<cstring>
#include<cassert>
#include<algorithm>
#include<numeric>

using namespace std;


int main()
{
	cout << "Demonstrating generic accumulate algorithm with  "
	     << "a reverse iterator"	
	     << endl;
	
	float small = (float) 1.0/ (1 << 26);
	float x[5] = {1.0, 3*small, 2*small, small, small};
	//float x[5] = {1.0, 2.0, 3.0, 4.0, 5.0};

	//Initialize vector to x[0] through  x[4]
	vector<float> vector1(&x[0], &x[5]);

	cout << "values to be added: " << endl;

	vector<float>::iterator i;

	cout.precision(10);
	for(i = vector1.begin(); i != vector1.end(); i++)
	{
		cout << *i << endl;		
	}
	cout << endl;		

	float sum = accumulate(vector1.begin(), vector1.end(), (float)0.0);
	
	cout << "Sum accumulated from left = " << sum << endl;

	float sum1 = accumulate(vector1.rbegin(), vector1.rend(), (float)0.0);
	cout << "Sum accumulated from right = " << sum1 << endl;
	
	

	return 0;
}