Dart Flow Control - Exercise 5

[prakashanuvadia]

Please make more exercise tutorial....because you explanation is great anybody who is not from programing background they also easily understand posting video Thanks

[Nabhandle]

i cant seem to access the past 3 dart exercises. are they still up?

[jimaustin]

Question 2:
Suggest there’s no need to parse the console input into an integer (choice) … and that doing so either
- requires more code to catch exceptions caused by input of non-numeric input, or
- the chance of ‘uncaught exceptions’ causing a crash if such input occurs.



Leaving the input as a (single- character) String allows the switch to deal with non-allowed inputs in the default case.

[rezaEsmkhani-yz]

hi could you please tell me why my cod doesn't work
void main() {
String email;
print('plz enter your email');
email = stdin.readLineSync()!;
var valid = email.contains('@') && email.contains('.');

while (valid == false) {
print('plz enter your email');
email = stdin.readLineSync()!;
var valid = email.contains('@') && email.contains('.');
}
}
and also in your answer when I use and it goes out of the loop when it only contain one of @ or . but it works well with or and i don't know

[itsahmed-dev]

Loop doesn't stop even when input is invalid

String menu = '''
Make your choice
1. McDonald's Fries
2. McDonald's Big Mac
3. McDonald's Breakfast Muffin
4. Exit
''';
var choice;
do {
print(menu);
var choice =
switch (choice) {
case 1:
print('McDonald\'s Fries');
print(''); // Line-Break
break;
case 2:
print('McDonald\'s Big Mac');
print(''); // Line-Break
break;
case 3:
print('McDonald\'s Breakfast Muffin');
print(''); // Line-Break
break;
case 4:
print('Have a nice day');
break;
default:
print('Invalid Choice');
}
} while (choice != 4);

[tertiusscheepers]

Learning a lot Thank you:

  const menu = """
\n
Please choose something from our menu:
1. McDonald's Fries
2. McDonald's Big Mac
3. McDonald's Breakfast Muffin
4. Exit
""";

  print(menu);

  int userChoice =

  while (userChoice != 4) {
    switch (userChoice) {
      case 1:
        print('You chose McDonalds Fries');
        print(menu);
        userChoice =
        break;
      case 2:
        print('You chose McDonalds Big Mac');
        print(menu);
        userChoice =
        break;
      case 3:
        print('You chose McDonalds Muffen');
        print(menu);
        userChoice =
        break;
      default:
        print('You made an invalid choice');
        print(menu);
        userChoice =
        break;
    }
  }