Dart Flow Control - Input Validation and User Controlled Loops

[amosgaslin]

Finally on the terminal and it is perfectly working after correcting the readLineSync error.💪

[letscode]

Your explanation is amazing sir. Thank you

[aditiaarianugraha]

Johan, I've got a problem regarding the output, when I run the the application and enter the number in the range it prints out the number is invalid whilst my code is the exact same thing as this

[Bruno-obog]

Hello, I have an issue with the code below, each time I run it with an invalid number like 400 its showing invalid number but when I try to enter a valid number such as 23 0r 45 it's still printing out invalid number. Kindly help....

print('Please enter a number in the range of 1 through 100');
int number =

while (number < 1 || number > 100) {
print('The number is invalid');
print('Please enter a number in the range of 1 through 100');
int number =
}

print('$number is valid');

[megsfamily]

Hey Johan, Thank you for your videos. Please can you show me how you can create folders in windows manually ? or using cmd in windows because i try it it doesn t work for me when i try to open the file in the terminal in VSCODE .Thank you in advance .

[nikashdeka]

Hi Johan, Firstly, Thanks for these wonderful tutorials. It's a saviour for a noob like me.
However, I am not able to validate and try-catch when a character (other than number) is entered. Will be greatful if you can help with the code below: (alos not sure if my code is correct )

import 'dart:io';

void main() {
String? number;

do {
stdout.write('Enter a number: ');
number = stdin.readLineSync();
try {
number ==
} catch (e) {
print('Please enter a number!');
}
} while (number == null || number.length == 0 || number.isEmpty);

int? num =

if (num.isEven) {
print('Even');
} else {
print('Odd');
}
}