arduino中case判断不能用

Question

int color;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(4,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(12,OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("which color led you want to light?");

  while(Serial.available()==0){
    
  }
  color = Serial.parseInt();
  switch(color){
    case 1:
    digitalWrite(4,1);
    digitalWrite(8,0);
    digitalWrite(12,0);

    case 2:
    digitalWrite(4,0);
    digitalWrite(8,1);
    digitalWrite(12,0);

    case 3:
    digitalWrite(4,0);
    digitalWrite(8,0);
    digitalWrite(12,1);

    default:
    digitalWrite(4,1);
    digitalWrite(8,1);
    digitalWrite(12,1);
    Serial.println("wrong input!");
    
    
  }
}

arduino的一个小程序，输入不同数字亮不同的灯，为什么case判断不能用？
不管输入1或2或3都只执行默认。

Answer 1

case 后面要加break语句
case 1:
//你的代码
break; //加这句话
case 2:
//你的代码
break;//加这句话
case 3:
//你的代码
break;//加这句话
default:
//你的代码
break;