aic_web_flutter_ex4.dart

void main() {
  print(sum1(100));
  
  print(sum2(100, start: 51));
  
  print(sum3(100, start: 21, step: 3));
}

int sum1(int value) {
  int result = 0;
  for(int i=1; i <= value; i++) {
    result += i;
  }
  return result;
}

int sum2(int value, {int start = 1}) {
  int result = 0;
  for(int i = start; i <= value; i++) {
    result += i;
  }
  return result;
}

int sum3(int value, {int start = 1, int step = 1}) {
  int result = 0;
  for(int i = start; i <= value; i += step) {
    result += i;
  }
  return result;
}