Serial Monitor comes out reversed question marks

Projects Programming
1 
#include <RFduinoBLE.h>

#include<Wire.h>
const int MPU_addr=0x68;
int16_t axis_X,axis_Y,axis_Z;
int minVal=265;
int maxVal=402;
double x;
double y;
double z;
 
void setup(){
  Wire.begin();
  Wire.beginTransmission(MPU_addr);
  Wire.write(0x6B);
  Wire.write(0);
  Wire.endTransmission(true);
  Serial.begin(9600);
  RFduinoBLE.advertisementData = "x";
  RFduinoBLE.deviceName = "RFDUINO1";
  RFduinoBLE.begin();
}
void loop(){
  Wire.beginTransmission(MPU_addr);
  Wire.write(0x3B);
  Wire.endTransmission(false);
  Wire.requestFrom(MPU_addr,14,true);
  axis_X=Wire.read()<<8|Wire.read();
  axis_Y=Wire.read()<<8|Wire.read();
  axis_Z=Wire.read()<<8|Wire.read();
    int xAng = map(axis_X,minVal,maxVal,-90,90);
    int yAng = map(axis_Y,minVal,maxVal,-90,90);
    int zAng = map(axis_Z,minVal,maxVal,-90,90);
       x= RAD_TO_DEG * (atan2(-yAng, -zAng)+PI);
       y= RAD_TO_DEG * (atan2(-xAng, -zAng)+PI);
       z= RAD_TO_DEG * (atan2(-yAng, -xAng)+PI);

    String stringVal= "";

    stringVal+=String(int(x))+ "."+String(getDecimal(x)); //combining both whole and decimal part in string with a fullstop between them
    Serial.print("stringVal: ");Serial.println(stringVal);              //display string value
  
    char charVal[stringVal.length()+1];                      //initialise character array to store the values
    stringVal.toCharArray(charVal,stringVal.length()+1);

    RFduinoBLE.send(charVal,5);
  
    Serial.print("Angle x = ");
    Serial.print(x);
    Serial.println((char)223);
  /* Serial.print("Angle y = ");
  Serial.print(y);
  Serial.println((char)176); */
 /* Serial.print("Angle z = ");
   Serial.print(z);
   Serial.println((char)176); */


   delay(1000);
}


long getDecimal(float val)
{
  int intPart = int(val);
  long decPart = 1000*(val-intPart); //I am multiplying by 1000 assuming that the foat values will have a maximum of 3 decimal places. 
                                    //Change to match the number of decimal places you need
  if(decPart>0)return(decPart);           //return the decimal part of float number if it is available 
  else if(decPart<0)return((-1)*decPart); //if negative, multiply by -1
  else if(decPart=0)return(00);    
}

I need help. Serial monitor captures the data I want it to display. However, there is a reversed question mark at the back.

I want to display a "°" at the back. Can anyone help me ?

2

Serial monitor can not display that. Get a real terminal program.

Tested printing (char)176 using PuTTY, changed the 'translation' to Win1252 (Western), and it prints the degree symbol.

3 
    stringVal.toCharArray(charVal,stringVal.length()+1);

This is WRONG. The second argument is the size of the array, NOT the length of the String. The method KNOWS how long the String is.

Besides, there is NO need to copy the data to a char array. You can get a pointer to the char array that the String instance wraps by using the c_str() method.

4

This might work:

Serial.print("\xC2\xB0");

based on a forum thread.