I'm sorry..
I am very new to this programming world..
Thank you for the response.
I already change like this...
Is this correct ?
const int limitsw = 9; // limit switch
const int magnetsens = 8; // magnetic sensor
const int leftsens = 2; // left sensor
const int rightsens = 3; // right sensor
/*-------definning Outputs------*/
const int leftmotor1 = 4; // left motor
const int leftmotor2 = 5; // left motor
const int rightmotor1 = 6; // right motor
const int rightmotor2 = 7; // right motor