condtional_statemtns

import 'dart:math';

main() {
  var money = 1500;

  if (money >= 1000)
    print("start transaction");
  else
    print("you do not have sufficient money ");

  // ternary operator
  // experssion ? statement1 : statement2;

  money >= 1000
      ? print("start transaction")
      : print("you do not have sufficient money ");

  var name = "Sai";

  name = name ?? "Default Name";
  print(name);

  if (name == null) {
    name = "Default Name";
    print("Name is not provided");
  } else {
    print("Name $name  provided");
  }

  // var name = "Narimeti Sai";

  // print("name length ${name.length}");

  var marks = pow(2, 8);

  // a++;
  // a = a + 1;
  // a += 1;

  if (marks < 60) {
    print("C Grade");
  } else if (marks >= 60 && marks <= 70) {
    print("B Grade");
  } else if (marks >= 60 && marks <= 70) {
    print("B Grade");
  } else if (marks >= 60 && marks <= 70) {
    print("B Grade");
  } else if (marks >= 60 && marks <= 70) {
    print("B Grade");
  } else {
    print("A Grade");
  }

  var grade = "A";

  // nested if else
  switch (grade) {
    case 'A':
      {
        print("Switch Grade A");
      }
      break;

    case "B":
      print("Switch Grade B");
      print("Switch Grade B");
      break;

    default:
      print("invalid input");

      break;
  }
}