Sum of odd and even numbers and search for a specific number inside the list

main.dart

import 'dart:io';
int sumEven(List li) {
  int sum = 0;
  for (var i in li) {
    if (i % 2 == 0) {
      sum = sum + i;
    }
    }
  return sum; 
  }
int sumOdd(List li) {
  int sum = 0;
  for (var i in li) {
    if (i % 2 == 1) {
      sum = sum + i;
    }
  }
  return sum;
}

void main() {
  var list = [];
  for (int i = 100; i > 0; i--) {
    list.add(i);
  }
  print(sumEven(list));
  print(sumOdd(list));
int input = int.parse(stdin.readLineSync());
	bool valid=false;
	for(var i in list){
		if (i== input){
			print("valid");
			valid=true;
		} 
	}
if (valid!=true){
	print("not valid");
}
 }