Can variable changes its value while the program is running

Answer 1

Yes, that is the whole point of having them.

int age = 6;
age = 7;
age += 3;

This creates an integer named “age” which has the value 6, it changes the value to 7, then adds 3 to the value. It is 10 at the end.

Answer 2

yes right

Answer 3

var number = 1;
for (int i = 0; i < 10; i++)
number++;
Console.Write(number);
// run and see what happens