Finding a source of light

i doing project have find , follow light. can follow light no problem once starts off in right direction have trouble detecting light orientation (given robot can placed in direction start).
i can use ldr's , have tried doing full 180 degree turn, making note of highest intensity , going it, code doesn't seem work.

#include <orangutanlcd.h>
#include <orangutanmotors.h>

int motor_speed = 70;
int left_ldr=6;
int right_ldr=7;
int x=analogread(left_ldr);
int y=analogread(right_ldr);
int starttime;
int currenttime;
int newintensity;
int highestintensity = 1500;
int timespinning;
int highesttime;
int z;

void setup()
{
  clear();
  void motors_init(void);
 
  delay(1000);
  set_motors(motor_speed,-motor_speed);
  starttime = millis();
  currenttime = starttime;
  while((currenttime-starttime)<1650)
  {
    newintensity = ((analogread(left_ldr) + analogread(right_ldr))/2);
    if(newintensity <= highestintensity)
    {
      highestintensity = newintensity;
      timespinning = millis();
    }
    currenttime = millis();
  }
  highesttime = timespinning - starttime;
  print_long(highesttime);
  delay(highesttime);
  set_motors(40,40);
}

is there thing wrong code or have better possible solution method? working pololu 3pi.

thanks!

quote

is there thing wrong code

besides being posted incorrectly? yes, isn't complete.

why there function prototype defined in setup()?
where clear()?
where loop()?

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