Error 'roll' was not declared in this scope.

so i'm trying make dice blue led's cycles through numbers 1 6 until ldr has value a.k.a. hand removed ldr. when making use 4 sets of led's connected 4 pins(http://prntscr.com/dr0hlx).
for code use
int value = 0;
int = 0;
int b = 0;
int c = 0;
int d = 0;
void setup() {
  pinmode(2, output);
  pinmode(3, output);
  pinmode(4, output);
  pinmode(5, output);
  pinmode(a0, input);
}

void loop() {
  if (value > 750) {
    roll(low, low, low, high);  //1
    roll(high, low, low, low);  //2
    roll(high, low, low, high); //3
    roll(high, low, high, low); //4
    roll(high, low, high, high);//5
    roll(high, high, high, low);//6
  }
  else {
    value = analogread(a0);
  }
}
void roll(int a, int b, int c, int d);
  value = analogread(a0);
  digitalwrite(2, a);
  digitalwrite(3, b);
  digitalwrite(4, c);
  digitalwrite(5, d);
  delay(50);
i planning on expanding first wanted see if cycle through numbers. everytime try test it, gives me error:
arduino: 1.6.13 (windows 10), board: "arduino/genuino uno"

c:\users\hidde\documents\arduino\dice\dice.ino: in function 'void loop()':

dice:16: error: 'roll' not declared in scope

     roll(low, low, low, high);  //1

                             ^

c:\users\hidde\documents\arduino\dice\dice.ino: @ global scope:

dice:28: error: 'value' not name type

   value = analogread(a0);

   ^

dice:29: error: expected constructor, destructor, or type conversion before '(' token

   digitalwrite(2, a);

               ^

dice:30: error: expected constructor, destructor, or type conversion before '(' token

   digitalwrite(3, b);

               ^

dice:31: error: expected constructor, destructor, or type conversion before '(' token

   digitalwrite(4, c);

               ^

dice:32: error: expected constructor, destructor, or type conversion before '(' token

   digitalwrite(5, d);

               ^

dice:33: error: expected constructor, destructor, or type conversion before '(' token

   delay(50);

        ^

exit status 1
'roll' not declared in scope

this report have more information with
"show verbose output during compilation"
option enabled in file -> preferences.
any tips?

hi - @ how setup , loop written, roll function has ; @ end , missing {}

code: [select]

int value = 0;
int = 0;
int b = 0;
int c = 0;
int d = 0;
void setup() {
  pinmode(2, output);
  pinmode(3, output);
  pinmode(4, output);
  pinmode(5, output);
  pinmode(a0, input);
}

void loop() {
  if (value > 750) {
    roll(low, low, low, high);  //1
    roll(high, low, low, low);  //2
    roll(high, low, low, high); //3
    roll(high, low, high, low); //4
    roll(high, low, high, high);//5
    roll(high, high, high, low);//6
  }
  else {
    value = analogread(a0);
  }
}
void roll(int a, int b, int c, int d)
{
  value = analogread(a0);
  digitalwrite(2, a);
  digitalwrite(3, b);
  digitalwrite(4, c);
  digitalwrite(5, d);
  delay(50);
}

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