#include <iostream>

using namespace std;

int main()
{
   FILE * outfile;

   char firstname[50];
   char lastname[50];
   int age;

   cout<<"Enter your firstname, lastname, then age\n";
   cin>>firstname>>lastname>>age;

   outfile = fopen("myfile.txt", "w");

   fprintf(outfile, "Hello %s\n", firstname);
   fprintf(outfile, "Hello %s %s\n", firstname, lastname);
   fprintf(outfile, "Hello %s %s\n", lastname, firstname);
   fprintf(outfile, "%s %s is %d years old\n", firstname, lastname, age);

   fclose(outfile);

   return 0;
}