Variables - Introduction to Dart

main.dart

//This is a single line comment

/*
 * This is a multiline comment
 * and can span more than one
 * line
 */

//Variables

/*
 * Containers for holding values
 */

int age = 25;
int distance = 200;
var score = 78; //inferred

String name = "Olaide";
String fullname = "Olaide Nojeem Ekeolere";
var grade = "A"; //inferred

bool accepted = false;
bool failed = true;
var sleeping = true;//inferred

//Functions

/*
 */

void helloWorld() {
  print("hello world!");
}

void main() {
  helloWorld();
  //print an outer variable
  print(fullname);
  
  //local variables
  int cars = 5;
  String city = "Lagos";
  print(city);
  print(cars);
  
  
  //Operations
  print(8 * 5);
  print(cars + 4);
  
  double result = 90 / 3;
  print(result);
  int division = 80 ~/ 4;
  print(division);
  
  int anotherScore = score + 10;
  print(anotherScore);
  
  
  //String concatination
  print("hello " + "word");
  print(name + " lives in " + city);
  String anotherString = city + " is large";
  print(anotherString);
  
  print("$name scored $score");
  
  //dynamic variable
  dynamic superstar = "I am a String";
  print(superstar);
  superstar = 70;
  print(" I am the integer $superstar");
  superstar = false;
  print("I am now a bool of $superstar");
  
  //constant variables
  const double pi = 3.14;
  
  //pi = 4.56;
  int radius = 70;
  var perimeter = 2 * pi * radius;
  print("Perimeter of circle with radius of $radius is $perimeter");
  
}