DART

dart while

void main() { 
   var num = 5; 
   var factorial = 1; 
   
   while(num >=1) { 
      factorial = factorial * num; 
      num--; 
   } 
   print("The factorial  is ${factorial}"); 
}

Dart while loop

while (expression) {
   Statement(s) to be executed if expression is true  
}