Exit status 1 'calculateSum' was not declared in this scope

[cut-me-own-throat_dibbler]

I hope this helps.....

const int arraysize = 100;
int x;
int sum = 0;
float average = 0;
int myarray[arraysize];

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

void loop() 
{
      sum = 0;  
      for (int i = 0; i < arraysize; i++)
      {
          x = random(200);
          myarray[i] = x;
      }
      sum = calculateSum(myarray);
      average = sum / 100;
      Serial.print(" Sum = ");
      Serial.print(sum);
      Serial.print(" , Average = ");
      Serial.printLn(average);
      delay(1000);
}
int calculateSum (int sumarray[])
[
for (int i = 0; i < arraysize; i++)
        {
              sum = sum + sumarray[i];
        }
    return sum;
}