i am new in dart and just want to know how to take integer input from user in dart with null safety. i found out a way to take number input from dart which is:
String? chossenNumber = stdin. readLineSync();
if(chossenNumber !=null)
{
int number = int.parse(chossenNumber);
}
but i am unable to use number variable outside of the scope. Please tell me a way to solve this issue.
You can define the variable at the top of the class and initialize it here so you will be able to use it everywhere in the class
The solution of it very simple just take input of number as String i.e
String? chossenNumber = stdin. readLineSync();
and when you want to use this variable parse it to the 'int' i.e
if(int.parse(chossenNumber) <100)
{
print("Your Statement");
}
You can define the variable at the top of the class
var name,age;
print('Enter Your Age : ');
age=int.parse(stdin.readLineSync()!) ;
print(age);
After retrieving chosenNumber for the stdin
String? chosenNumber = stdin.readLineSync();
You can declare number at the top of the method as a nullable integer, for example:
int? number;
Then after your check, you can initialize number
if (chosenNumber != null) {
number = int.parse(chosenNumber);
}
This way you will have access to number outside the if scope
Summary
String? chosenNumber = stdin.readLineSync();
int? number;
if (chosenNumber != null) {
number = int.parse(chosenNumber);
}
print(number); // number is accessible here
number = 19; // and here
