C 編譯錯誤：在程序中雜散 '\\200' 和預期的 ')' 之前的數字常量

Question

我復制了這個程序，但在使用 void downFrequency 函數時遇到了問題（我認為）。

這是針對Arduino Uno 的。 以下是編譯器錯誤：

為“Arduino Uno”編譯“MY_dds”

MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : stray '\342' in program
MY_dds.ino : stray '\200' in program
MY_dds.ino : stray '\223' in program
MY_dds.ino : : In function 'void downFrequency()':
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
MY_dds.ino : expected `)' before numeric constant
Error compiling

這是程序：

#include <stdio.h>
#include <dds.h>
#include <LiquidCrystal.h>

#define RESET 13
#define data_pin 12
#define load_pin A5
#define clock_pin A4
#define clock_hz 120000000LL
#define calibrationValue -0.0400000 // This is a value we change to calibrate
                                    // our particular chip more accurately
#define buttonPin A0

// chip, data_pin, load_pin, clock_pin, clock_hz
dds ddschip(DDS9850, data_pin, load_pin,  // Set my dds up with 120 MHz
            clock_pin, clock_hz);         // onboard crystal

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

// Some variables to use in our program
long toFrequency = 14070000;
long currentFrequency;
long maxFrequency = 40000000;
long minFrequency = 0;
int incrementNumber = 6;
int maxprogramnumber = 6; // Don't forget to increase the menu numbers here!!
int programnumber = 1;

void setup()
{
  Serial.begin(9600);
  Serial.println("Beginning Setup");

  // Set up the LCD’s number of columns and rows:
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T.Robb V0.1b "); // Print a little message
  lcd.setCursor(0, 1);
  lcd.print(" DDS Sine wave ");
  delay(2000);

  // Set up pins
  pinMode(RESET, OUTPUT);
  pinMode(data_pin, OUTPUT);
  pinMode(load_pin, OUTPUT);
  pinMode(clock_pin, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);

  ddschip.calibrate(calibrationValue); // This is a value we change to calibrate
                                       // our particular chip more accurately
  ddschip.setfrequency(toFrequency);
  lcd.clear();
}

void loop()
{
  if(toFrequency >= maxFrequency)
  {
    (toFrequency = maxFrequency);
  }

  if(toFrequency <= minFrequency)
  {
    (toFrequency = minFrequency);
  }

  ddschip.setfrequency(toFrequency);
  currentFrequency = toFrequency;

  switch(incrementNumber)
  {
    case 0:
      Serial.println("increment amount is 1 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 1 Hz");
      break;

    case 1:
      Serial.println("increment amount is 10 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 10 Hz ");
      break;

    case 2:
      Serial.println("increment amount is 100 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 100 Hz ");
      break;

    case 3:
      Serial.println("increment amount is 1 000 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 1 kHz");
      break;

    case 4:
      Serial.println("increment amount is 10 000 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 10 kHz");
      break;

    case 5:
      Serial.println("increment amount is 100 000 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 100 kHz");
      break;

    case 6:
      Serial.println("increment amount is 1 000 000hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 1 MHz");
      break;

    default:
      Serial.println("increment amount is 100 Hz");
      lcd.setCursor(0, 0);
      lcd.print("Change By 100 Hz ");
      break;
  }

  lcd.setCursor(0, 1);
  lcd.print("Freq is "); // Print to LCD
  lcd.setCursor(8, 1);
  lcd.print(currentFrequency);

  Serial.println(incrementNumber); // Temporary for debugging delete me

  Serial.print("Current frequency is set to: ");
  Serial.println(currentFrequency);

  while((analogRead(buttonPin))>=1000) // Do nothing while no buttons pressed to chill out
  {
  }

  delay(5);
  if (analogRead(buttonPin)>=100 && analogRead(buttonPin) <= 200) // We have pushed up
  {
    upFrequency();
    delay(300);
  }

  if(analogRead(buttonPin)>=200 && analogRead(buttonPin) <= 400) // We have pushed down
  {
    downFrequency();
    delay(300);
  }

  if ((analogRead(buttonPin)) <= 50) // We have pushed right
  {
    incrementNumber++;
    delay(300);
  }

  if(analogRead(buttonPin) >= 400 && analogRead(buttonPin)<=600) // We have pushed left
  {
    incrementNumber–;
    delay(300);
  }

  if(incrementNumber > 6) // This is where the menu goes around and around
  {
    incrementNumber = 0;
  }
  if(incrementNumber < 0)
  {
    incrementNumber = 6;
  }

  delay(100);
  lcd.clear();
}

void upFrequency()
{
  Serial.println("Going UP Frequency");
  switch(incrementNumber)
  {
    case 0:
      toFrequency = (toFrequency + 1);
      break;

    case 1:
      toFrequency = (toFrequency + 10);
      break;

    case 2:
      toFrequency = (toFrequency + 100);
      break;

    case 3:
      toFrequency = (toFrequency + 1000);
      break;

    case 4:
      toFrequency = (toFrequency + 10000);
      break;

    case 5:
      toFrequency = (toFrequency + 100000);
      break;

    case 6:
      toFrequency = (toFrequency + 1000000);
      break;

    default:
      toFrequency = (toFrequency + 10);
      break;
  }

}


void downFrequency()
{
  Serial.println("Going DOWN Frequency");
  switch(incrementNumber)
  {
    case 0:
      toFrequency = (toFrequency – 1);
      break;

    case 1:
      toFrequency = (toFrequency – 10);
      break;

    case 2:
      toFrequency = (toFrequency – 100);
      break;

    case 3:
      toFrequency = (toFrequency – 1000);
      break;

    case 4:
      toFrequency = (toFrequency – 10000);
      break;

    case 5:
      toFrequency = (toFrequency – 100000);
      break;

    case 6:
     toFrequency = (toFrequency – 1000000);
     break;

    default:
      toFrequency = (toFrequency – 10);
      break;
  }

}

Answer 1

您在downFrequency函數中以某種方式結束了“破折號”字符，而不是正常的減號。

確保您使用文本編輯器而不是文字處理器進行編輯； 並且對於這些中的每一個：

toFrequency = (toFrequency – 1);
                           ^

刪除標記的字符，然后重新鍵入正常的減號。

（如果您對血腥細節感興趣，“破折號”字符是Unicode 2013 ，以 UTF-8 編碼為三個字節，八進制值為 324,200,223，這就是您在錯誤消息中看到這些數字的原因。）

Answer 2

編譯器抱怨您的源文件中有非 ASCII 字符。

我的八進制 fu 生銹了，但對我來說它看起來像 UTF-8。 342 200 223是0xE2 0x80 0x93 ，它是 Unicode代碼點“ EN DASH” 。 具有美容學位的文本編輯器對這段代碼進行了減號改造。

Answer 3

可能你的雙引號 (") 是錯誤的。請檢查它們是否真的是" ，而不是” 。

Answer 4

簡單的復制總是弄亂源代碼。

可以通過cat -A yoursrc.c檢查“流浪”問題。

對我來說，我通常分兩步用 Vim 重新格式化代碼。

vim yoursrc.c
:%!tr -cd '[:print:]\n'

然后編譯， gcc yoursrc.c 。