/* p7.c */

#include <stdio.h>

int main()
{
   int old;     // most recent old value;
   int older;   // less recent old value;
   int new;     // new value;
   int counter; // number of values printed so far

   older = 0;
   fprintf(stdout, "%d\n", older);

   old = 1;
   fprintf(stdout, "%d\n", old);

   counter = 2;
   while (counter < 20)
   {
      new = old + older;
      fprintf(stdout, "%d\n", new);
      counter = counter + 1;
      older = old;
      old = new;
   }
}