You See It Everywhere

#include <stdio.h>
int main()
{
  int f, n;
  int count;
  f = n = 1;
  count=0;
  while( count < 20 ) {
    printf("%d ", f);
    f+=n;
    printf("%d ", n);
    n+=f;
    count+=2;
  }
  putchar('\n');
  return(0);
}