//strings c++ stringsoperatorsCpp.cpp
#include <iostream> 
#include <cstdlib>
#include <string>
using namespace std;
int main(int argc, char *argv[])
{  string str1 = "good";
   string str2 = "morning";
   string str3 = "everybody", str4, space=" ";
   int  len ;   
   cout<<"Input a string: ";
   getline(cin, str4);  // input
   cout<<"str4 is: "<<str4<<endl; //output str4
   len = str4.size(); // lenghth of str4 
   cout << "str4.size():  " << len << endl;
   cout << "set str4 = str1 + space + str2 + space + str3: " << endl;
   str4 = str1 + space + str2 + space + str3; // concatenation with +
   cout << "str4 now is: "<<str4<<endl;
   len = str4.length(); // lenghth of str4 
   cout << "str4.length():  " << len << endl;
   cout << "The last character of str4 is: "<<str4[len-1]<<endl;
   cout << "The last character of str4 is: "<<str4.at(len-1)<<endl;
   if (str1<str2) cout<<str1<<"<"<<str2<<endl; else cout<<str2<<"<="<<str1<<endl;
   char alpha[27] = 
     {'a','b','c','d','e','f','g','h','i',
     'j','k','l','m','n','o','p','q','r',
     's','t','u','v','w','x','y','z',' '};
     int alphafreq[27]={0};
   cout<<"Chatacters in str4: ";
   len=str4.length();
   for (int i=0; i<len; i++)
        if (i<len-1) cout<<str4[i]<<","; else cout<<str4[i]<<endl;     
   cout<<"Frequency of chatacters in str4"<<endl;
   for (int i=0; i<len; i++)
     {char ch=str4.at(i);
     for (int j=0; j<27; j++)
       {if (ch==alpha[j]) alphafreq[j]++;}
     }  
   for (int j=0; j<27; j++)
     if (alphafreq[j]!=0) cout<<alpha[j]<<": "<<alphafreq[j]<<" times"<<endl;   
  system("PAUSE");
  return 0;
}