Understanding asynchronous and synchronous in Dart - flutter

Question

We know that in Dart everything runs synchronously and according to some definition I found on internet
When you execute something synchronously, you wait for it to finish before moving on to another task. When you execute something asynchronously, you can move on to another task before it finishes.
What I don't understand here is that why b is printed before c I mean if code is running synchronously then it should wait for completion of line 2 to print c and only after printing c
It should print b
Ps- I know I can use async and await keywords to wait for line 2 to complete it's execution. I just want to understand how this synchronous code works.
void main(){
print("a");
Future.delayed(Duration(seconds:
5),(){
print("c");
});
print("b");
}
Output- a
b
c

Answer 1

When you write :
print("a");
Future.delayed(Duration(seconds: 5),(){
print("c");
});
print("b");
You tell the program to print "a", then to launch a Future that will resolve in 5 seconds and print "c", then to print "b"; but you never tell the program to wait for the Future to complete.
Which is synchronous.
And this is why you must use await keyword to make the program wait for the Future completion before moving to next instruction.

Answer 2

No not really. It would only print c before b if you use the await keyword. This keyword tells Dart to wait till this future is complete and then move on to the next task.
For example
void main() async {
print("a");
//await tells dart to wait till this completes. If it's not used before a future, then dart doesn't wait till the future is completed and executes the next tasks/code.
await Future.delayed(Duration(seconds:
5),(){
print("c");
});
print("b");
}
Output
Output- a
c
b