Strcat and Strncat Program

#include <iostream.h>
#include <string.h>
 int main()
 {
 char s1[ 20 ] = "Happy ";
 char s2[] = "New Year ";
 char s3[ 40 ] = "";
 cout << "s1 = " << s1 << "\ns2 = " << s2;
 cout << "\nstrcat(s1, s2) = " << strcat( s1, s2 );
 cout << "\nstrncat(s3, s1, 6) = " << strncat( s3, s1, 6 );
 cout << "\nstrcat(s3, s1) = " << strcat( s3, s1 ) << endl;
 return 0;
 }

OUTPUT:
      s1 = Happy
      s2 = New Year
      strcat(s1, s2) = Happy New Year
      strncat(s3, s1, 6) = Happy
      strcat(s3, s1) = Happy Happy New Year