#include <stdio.h>

int main() {
  float f = 0.0, df = 1.0;
  double d = 0.0, dd = 1.0;
  int i;
  for(i=0; i<20; i++) {
    f += df;
    d += dd;
    df *= 0.1;
    dd *= 0.1;
    printf("%d: float: %22.20f; double: %22.20lf\n",i , f, d);
  }
  return 0;
}