c - 简单修复？ '(' token 之前应为 '!'

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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已关闭 7 年前。

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所以我正在使用 DHT11 热/湿度传感器。我已经让一切正常工作，我只是想在没有变化的情况下减少输出。在添加此行之前，没有任何问题。如果您能告诉我我的错误而不是告诉我更好的方法，我将不胜感激。这只是为了让我知道哪里出了问题。

if!(f > priorT + 2 && f < priorT -2 && i = 1)  //in a non-repetitive fashion dictated by the counter, if there isnt a large change, do not output. 

下面提供了完整的错误消息和代码。

代码:

    #include <dht.h>

#define dht_apin A0 // Analog Pin sensor is connected to

dht DHT;

int BLED=9;
int GLED=10;
int RLED=11;

void setup(){

  Serial.begin(9600);

  delay(1000);//Delay to let system boot

  Serial.println("DHT11 Humidity & temperature Sensor\n\n");

  delay(500);//Wait before accessing Sensor

  // initializing output to RGB LED

  pinMode (BLED, OUTPUT);
  pinMode (GLED, OUTPUT);
  pinMode (RLED, OUTPUT);

  digitalWrite(RLED, 127);        //show that initialization is complete
  digitalWrite(GLED, 0);
  digitalWrite(BLED, 0);

  delay(200);

  digitalWrite(RLED, 0);
}//end "setup()"



void loop(){


  double f, priorT, currentT;  //variables for conversion and temperature change determination.
  int i = 0;                       //counter
  DHT.read11(dht_apin);

    f = DHT.temperature * 1.8 + 32;     //fahrenheit conversion from DHT.Temperature

    priorT = currentT;

    currentT = f;


    if!(f > priorT + 2 && f < priorT -2 && i = 1)  //in a non-repetitive fashion dictated by the counter, if there isnt a large change, do not output.
    {
      Serial.print("Awaiting status change.");
      i++;
    }

    else if(f > priorT + 2 && f < priorT -2)        //if there is a temperature change, output the change
    {
      Serial.print("Current humidity = ");

      Serial.print(DHT.humidity);

      Serial.print("%  ");

      Serial.print("temperature = ");

      Serial.print(DHT.temperature); 

      Serial.print("C  ");

      Serial.print(f);
      Serial.println(" F");
      i = 0;
    }
    if(f < 70 && f > 40)
    {
      digitalWrite(BLED, 90);
      digitalWrite(RLED, 0);
      digitalWrite(GLED, 0);
    }
    else if(f > 70 && f < 90)
    {
      digitalWrite(BLED, 0);
      digitalWrite(RLED, 0);
      digitalWrite(GLED, 127);
    }
    else if(f < 40)
    {
      digitalWrite(BLED, 127);
      digitalWrite(RLED, 0);
      digitalWrite(GLED, 0);

    }
    else if(f > 90)
    {
      digitalWrite(RLED, 127);
      digitalWrite(GLED, 0);
      digitalWrite(BLED, LOW);
    }

  delay(5000);//Wait 5 seconds before accessing sensor again.

  i++;


}

错误消息:

Arduino: 1.6.7 (Windows 7), Board: "Arduino/Genuino Uno"

C:\Users\Xxwitherpoon\Documents\Arduino\Sensors\DHT11andRGBLED\DHT11andRGBLED.ino: In function 'void loop()':

DHT11andRGBLED:52: error: expected '(' before '!' token

     if!(f > priorT + 2 && f < priorT -2 && i = 1)  //in a non-repetitive fashion dictated by the counter, if there isnt a large change, do not output.

       ^

DHT11andRGBLED:58: error: 'else' without a previous 'if'

     else if(f > priorT + 2 && f < priorT -2)        //if there is a temperature change, output the change

     ^

exit status 1
expected '(' before '!' token

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.

Answer 1

您需要另一组括号

if(!(f > priorT + 2 && f < priorT -2 && i = 1))