digital stream input

#include<iostream>
#include<sstream>
using namespace std;
int main()
{
    int i=0,j;
    double a[100];
    string s;
    getline (cin, s);
    stringstream ss;
    ss<<s;
    while(ss>>a[i]) i++;
    for(j=0;j<i;j++)
    cout<<a[j]<<endl;
}

Even if you don't understand it, just memorize it by rote