solution

1.

```
import 'dart:io';

void main() {    
    stdout.write("What's your name? ");
    String name = stdin.readLineSync();

    print("Hi, $name! What is your age?");
    int age = int.parse(stdin.readLineSync());

    int yearsToHunderd = 100 - age;
    print("$name, You have $yearsToHunderd years to be 100");
}

2.
   List<int> a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89];
   for(var i in a){
         if(i<5){
           print(i);
           }
         }
3.

  final int netSalary= 10000;
  final int expenses= 9000;
  if(netSalary<expenses){
    print('You should earn more money ');
  }else if(netSalary>expenses){
    print('You can spend more money');
  }else{
    print('Your salary and expenses are same');
  }
  
4.
    final int netSalary= 10000;
    final int expenses= 9000;
    
    netsalary<expenses? print('You should earn more money '): print('You can spend more money');
  
5.

  for(int i = 0; i <=5; i++){
    print('* ' * i);
  }
```