ISO C++ forbids comparison between pointer and integer [-fpermissive] error

Projects Programming
1

Recently I have beng using blynk and Arduino for my projects. I wanted to make a utonomous car which follows me. though I keep getting this error while verifying. ISO C++ forbids comparison between pointer and integer [-fpermissive]

I have a float called Geo Distance which is basically the distance betweeen the car and the phone. Here is the code for the float:

float geoDistance(struct GeoLoc &a, struct GeoLoc &b) {
  const float R = 6371000;
  float p1 = a.lat * DEGTORAD;
  float p2 = b.lat * DEGTORAD;
  float dp = (b.lat - a.lat) * DEGTORAD;
  float dl = (b.lon - a.lon) * DEGTORAD;

  float x = sin(dp / 2) * sin(dp / 2) + cos(p1) * cos(p2) * sin(dl / 2) * sin(dl / 2);
  float y = 2 * atan2(sqrt(x), sqrt(1 - x));

  return R * y;
}

In my variable for moving the car there is an if statement:

void drive(int distance, float turn) {
  int fullSpeed = 230;
  int stopSpeed = 0;
  int s = fullSpeed;
  
  if ( 8 > geoDistance ) {
    int wouldBeSpeed = s - stopSpeed;
    wouldBeSpeed *= distance / 8.0f;
    s = stopSpeed + wouldBeSpeed;
  }
]

In the if statement basically if the distance is less than 8 I want it to stop. This is where the error is happening. Any help would be appreciated

2

Post the entire text of the error message. Paraphrasing leaves out important information.

3

here is the full errror:

/home/pi/Arduino/car_raspberry_pi/car_raspberry_pi.ino: In function 'void drive(int, float)':
/home/pi/Arduino/car_raspberry_pi/car_raspberry_pi.ino:264:12: warning: ISO C++ forbids comparison between pointer and integer [-fpermissive]
if ( 8 > geoDistance ) {
^~~~~~~~~~~
The weird thing is after showing the error the code compiles so I am not sure if it is working. I am using arduino on my raspberry pi buit the same thing is happening on my laptop.

4

so, I tried to make my 8 into a decimal like a float but now I am getting a new error

Arduino: 1.8.12 (Linux), Board: "Arduino Uno"

/home/pi/Arduino/car_raspberry_pi/car_raspberry_pi.ino: In function 'void drive(int, float)':
car_raspberry_pi:264:19: error: invalid operands of types 'float(GeoLoc&, GeoLoc&)' and 'double' to binary 'operator<'
if (geoDistance < 8.0 ) {


exit status 1
invalid operands of types 'float(GeoLoc&, GeoLoc&)' and 'double' to binary 'operator<'

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

even after show verbode output during compilation is enabled I get the same error.
I am very confused.
5

geoDistance is a pointer

try
if (geoDistance(x,y) < 8.0 )

6

Turns out I made a mistake in my code. Instead of geoDistance over there it was suppose to be distance. Which I had put as an integer in brackets. Sorry for disturbing you all.