Problem with my linesensor

I have a problem, I am making a robot for a project for school the robot has to follow a line. I am trying to get the line sensor to work but it isn't working.

my code:

int LINKER_sensor = A1;
int LINKER_MIDDEN_sensor = A2;
int MIDDEN_sensor = A3;
int RECHTER_MIDDEN_sensor = A4;
int RECHTER_sensor = A5;

void setup() {
Serial.begin(9600);

pinMode(A1, INPUT);
pinMode(A2, INPUT);
pinMode(A3, INPUT);
pinMode(A4, INPUT);
pinMode(A5, INPUT);
}

void loop() {

analogRead(LINKER_sensor);
Serial.print("linker waarde: ");
Serial.println(LINKER_sensor);
analogRead(LINKER_MIDDEN_sensor);
Serial.print("linker waarde: ");
Serial.println(LINKER_MIDDEN_sensor);
analogRead(MIDDEN_sensor);
Serial.print("midden waarde: ");
Serial.println(MIDDEN_sensor);
analogRead(RECHTER_MIDDEN_sensor);
Serial.print("rechter waarde: ");
Serial.println(RECHTER_MIDDEN_sensor);
analogRead(RECHTER_sensor);
Serial.print("rechter waarde: ");
Serial.println(RECHTER_sensor);
}

What Arduino? What line sensor (post data sheet)?

Post a schematic.

What does the code actually do? What should it do?

Read the how get the most out of this forum sticky to see how to properly post code. Remove useless white space and format the code with the IDE autoformat tool (crtl-t or Tools, Auto Format) before posting code.