string c++

[alikdemon]

Write a program that will find the first occurance of the given keyword in the given text.
I have it displayed the symbol index and not index words, how to fix?
for example:
input: This is sentences
is
output: 2

#include <iostream>
#include <string>
using namespace std;

int main ()
{
   int index=0;
   string str;
   string key;
   getline(cin,str);
   getline(cin,key);
   index = str.rfind(key);

  cout <<index<<endl;
  return 0;
}

[Chervil]

Well, by definition, if the search is successful, the word found must be the same as key. But you do need to check that the search was successful.

    if (index != string::npos)
    {
        cout << key << " was found at position " << index << endl;
    }

find the first occurance

note rfind() searches for the last, not first occurrence.
http://www.cplusplus.com/reference/string/string/rfind/