int R = 5;
float volume;
void setup() {
 Serial.begin(9600);  
}

void loop() {
  while(R > 0){
    volume = (4/3) * (3.14) * R * R * R; 
     Serial.print("A sphere with radius ");
    Serial.print(R);
    Serial.print(" is ");
    Serial.println(volume);
    R -= 1;
    delay(1000);
  }
  R = 5;
}