How to output a string two letters at a time?

[pdgaming]

I am trying to read from a file that contains sentences and output them two letters at a time.

IE: 
    >hello world
    >how are toy

Output:
        he ll ow or ld
        ho wa re to y

Here is what I have.

  
#include<iostream>
#include<string>
#include<fstream>

using namespace std;

int main()
{
  string input;

  getline(cin, input);

  for(int i = 0; i < input.lenght(); i++)
  {
    cout << input[i] << input[i+1] << " ";
  }

  return 0;
}

and this is what it currently outputs for lets say for example, "hello world"

output:
       
        h he el ll lo ow eo or rl ld d

How do I fix it? will I have to somehow use vectors (I am awful at those so I am dreading it)

[jvlinh]

for(int i = 0; i < input.lenght(); i++)
  {
    cout << input[i] << input[i+1] << " ";
  }

i starts at 0, next loop is 1
you want to add 1 to i

[whitenite1]

@pdgaming

The best way to get every two letters printed, would be.

int len = input.lenght(); // Best to use actual variable 
for(int i = 0; i < len; i+=2) // Increase i by two's
  {
    cout << input[i] << input[i+1] << " ";
  }

[gunnerfunner]

#include <iostream>
#include <string>

int main()
{
  std::string input;

  getline(std::cin, input);

  for(std::string::size_type i = 0; i < input.size(); i+=2)
  {
    std::cout << input[i] << input[i+1] << " ";
  }
}

[Chervil]

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>

using namespace std;

int main()
{
    string input;

    getline(cin, input);

    istringstream ss(input);

    for (char ch; ss >> ch; )
    {
        cout << ch;
        if (ss >> ch)
            cout << ch << ' ';
    }

}

[lastchance]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

#include <iostream> #include <string> #include <cctype> using namespace std; void printEvery( string text, int n, char space ) { int countDown = n; for ( char c : text ) { if ( isgraph( c ) ) // choose isgraph(), isalpha(), etc. { if ( !countDown ) { cout << space; countDown = n; } countDown--; cout << c; } } cout << endl; } int main() { printEvery( "Hello world!", 2, ' ' ); printEvery( "This is a silly sentence taken in fours", 4, '-' ); }

He ll ow or ld ! This-isas-illy-sent-ence-take-ninf-ours