Lab4 - Summation of Prime Number

void setup() {
  size(250, 150);
  background(50);
  int minNumber = 0;
  int maxNumber = 20;
  int sum = 0;

  int space = 30;
  textAlign(CENTER);
  text("Sum of Prime Number", width/2, height/2-space);
  text(minNumber+" - "+maxNumber, width/2, height/2);
  while (minNumber <= maxNumber) {
    if (prime(minNumber)) {
      sum += minNumber;
    }
    minNumber++;
  }
  text("Sum = "+sum, width/2, height/2+space);
}
boolean prime(int value) {
  int num = 2;
  while (num <= value) {
    if (value%num == 0) {
      if (value == num) {
        return true;
      } else {
        return false;
      }
    }
    num++;
  }
  return false;
}