while compiler write :
ebc95803-3963-4032-87c1-67e160a8f044
ebc95803-3963-4032-87c1-67e160a8f044(9) : error C2039: 'getline' : is not a member of 'std'
ebc95803-3963-4032-87c1-67e160a8f044(9) : error C3861: 'getline': identifier not found


#include <iostream>

using namespace std;

int main()
{
    string line;
    int sum;
    while ( getline(cin,line) )
    {
        sum=0;
        for (unsigned int i=0;i<line.length();i++)
        {
            if (line[i]!=' ')
            {
                sum=sum+(line[i]-1)%3+1;
            }
            else
            {
                sum++;
            }
        }
        cout<<sum<<"\n";
    }
}

while we can see in example...

#include <iostream>
...
// numbers
int n;
while (std::cin >> n)
{
   ...
}
// lines
std::string line;
while (std::getline(std::cin, line))
{
   ...
}
// characters
char c;
while (std::cin.get(c))
{
   ...
}

or example is wrong ?