Question

下面这段Arduino程序有什么问题?

String receivedMessage = "04.100";
String currentOutputNumber;
String currentValueNumber;
currentOutputNumber= receivedMessage.substring(0,2);///这是出错的行
void setup()
{
Serial.begin(9600);
while(!Serial){
};
}
void loop()
{
currentValueNumber = receivedMessage.substring(3);
Serial.println(currentOutputNumber);
Serial.println(currentValueNumber);
while(1){
};
}
;;===============================================================================
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
Arduino: 1.0.6 (Windows XP), Board: "Arduino Uno"
sketch_nov01a:4: error: expected constructor, destructor, or type conversion before '=' token

Answer 1

应该在程序体里面调用方法，不能在声明部分调用
也就是说你应该把
currentOutputNumber= receivedMessage.substring(0,2);

放在setup中

Answer 2

需要帮你做设计吗