Taking Inputs from User and perform Addition, Subtraction, Multiplication, Division

 import "dart:io";

/// First Way as shown below
// void main() {
//   var num1,num2,total,total1,total2,total3;
//    print("Please Enter Number 1: ");
//    num1 = stdin.readLineSync();
//    print("Please Enter Number 2: ");
//    num2 = stdin.readLineSync();
//    total = (int.parse(num1) + int.parse(num2));
//    total1 = (int.parse(num1) - int.parse(num2));
//    total2 = (int.parse(num1) * int.parse(num2));
//    total3 = (int.parse(num1) / int.parse(num2));
//    print(total);
//    print(total1);
//    print(total2);
//    print(total3);
// }

/// Second Way as shown below
void main() {
 var num1,num2,total,total1,total2,total3;
 print("Please Enter Number 1: ");
 num1 = int.parse(stdin.readLineSync()!);
 print("Please Enter Number 2: ");
 num2 = int.parse(stdin.readLineSync()!);
 total = (num1 + num2);
 total1 = (num1 - num2);
 total2 = (num1 * num2);
 total3 = (num1 / num2);
 print(total);
 print(total1);
 print(total2);
 print(total3);
}