#include <iostream>
#include <string.h>// c cstring strstr funtion
using namespace std;
// compare_substr_Cstrstr1.cpp
string str1; string str2; 
int main()
{
    // char * strstr ( const char *, const char * ); 
	char chstr1[] ="This is a test char array";
	char * pch1; 
	char pch2[20]; 
	  pch1 = strstr (chstr1,"test");
	  cout<<"\n pch1 = strstr (chstr1,'test') "<<endl;
	  //prints sequence staring with test
	  cout<< "\t pch1 :" << pch1 << endl; 
	  strncpy (pch1,"test",5);
	  strncpy (pch2,"is a",5);
	  cout<<" copied a char sequcne with strncpy \n \t"; 
	  cout <<pch1 << "  "<< pch2<< endl;
	  // string::substr
	 str1 =  "This is a test string of string class";
	 str2 = str1.substr (8,13); 
	 // prints characters from 8 to 13
	 cout<<"\n str2 = str1.substr (8,13); \n\t"<<  str2 <<endl; 
      
	 return 0;
}