#include <iostream>
#include <cstring>   // c-string function declarations
using namespace std;


int main()
{    
   char s1[5] = "bass";  // need space of null terminator
   char s2[15] = "guitar";
   char s3[20];

   // returns 4 NOT 5 
   int len = strlen(s1);    
   
   // outputs a negative number, s1 comes before s2.
   cout << strcmp(s1, s2) << endl; 
   
   // outputs 0, they are the same
   cout << strcmp(s1,s1) << endl;
   
   // outputs a positive number
   cout << strcmp(s2,s1) << endl;
   
   // copy s2 in s3, including null character, return s3  
   strcpy(s3,s1);
   cout << "s3 is " << s3 << endl;
   
   // append " " at the end of s3
   strcat(s3, " ");
   // append "guitar" at the end of s3
   // Always make sure there is enough room to append.
   // Results are unpredictable during runtime.
   strcat(s3, s2);
   cout << "s3 is " << s3 << endl;
    
   system("pause");
   return 0;
}