Switch_case_Dart

 import "dart:io";

class Task {
  var value1, value2;

  void addition(int a, int b) {
    value1 = a;
    value2 = b;
    var sum = value1 + value2;
    print(sum);
  }
  void subtraction(int c, int d) {
    value1 = c;
    value2 = d;
    var sub = value1 - value2;
    print(sub);
  }
  void multiplication(int e, int f) {
    value1 = e;
    value2 = f;
    var mul = value1 * value2;
    print(mul);
  }
  void division(int a, int b) {
    value1 = a;
    value2 = b;
    var div = value1 / value2;
    print(div);
  }
}
void main() {
  Task object = new Task();
  print("Please Enter the value of Number 1 : ");
  var no1 = stdin.readLineSync();
  print("Please Enter the value of Number 2 : ");
  var no2 = stdin.readLineSync();
  print("Please select choice from below options: ");
  print("1 : (Addition)\n2 : (Subtraction)\n3 : (Multiplication)\n4 : (Division)");
  print("Enter your choice : ");
  var choice = int.parse(stdin.readLineSync()!);

  switch(choice) {
    case 1 : {
      print("Sum is : ");
      object.addition(int.parse(no1!), int.parse(no2!));
    } break;
    case 2 : {
      print("Subtraction is : ");
      object.subtraction(int.parse(no1!), int.parse(no2!));
    } break;
    case 3 : {
      print("Multiplication is : ");
      object.multiplication(int.parse(no1!), int.parse(no2!));
    } break;
    case 4 : {
      print("Division is : ");
      object.division(int.parse(no1!), int.parse(no2!));
    } break;
    default: {
      print("Please Select correct choice");
    }
  }
}