gistfile1.c

static float floatvar = 12345.67;
static char sprintfbuffer[2];
static char dtostrfbuffer1[2];
static char dtostrfbuffer2[2];

void setup() {
  sprintf(sprintfbuffer,"%f", floatvar);
  dtostrf(floatvar,8, 2, dtostrfbuffer1);
  dtostrf(floatvar,8, 2, dtostrfbuffer2);

  Serial.begin(9600);
  Serial.print("sprintf: ");
  Serial.println(sprintfbuffer);
  Serial.print("dtostrf1: ");
  Serial.println(dtostrfbuffer1);
  Serial.print("dtostrf2: ");
  Serial.println(dtostrfbuffer2);
}

void loop(){
}