Num dounding to 1, 1.5, 2.0 et

numrounding.dart

main(){
  print(round(2.4));
  print(round(2.1));
  print(round(2.6));
  print(round(2.8));

}

double round(double num){
  double decimal = double.parse((num - num.toInt()).toStringAsFixed(1));
  double newDecimal = 0.0;
  if(decimal>0 && decimal <= 0.5){
    newDecimal = 0.5;
  }
  else{
    newDecimal = 1.0;
  }
  
  return num.toInt() + newDecimal;
}