Homework after class

Difference between a value type and a reference type

As an example,

such as a1=18, this time in memory is 18, when the A1 pay A2, they both apply the same memory space, 18 will be saved as A1 value, when the A2 to 20 is, should be A1 and A2 reference is the same value, So A1 also becomes 20, which is the reference type

   A value type is a value that is stored A1 for A2 in a new space when the A1 is paid to A2 . When the A2 is changed  into a A2 in the space to save, and A1 it is not related A1 and A2 The values do not conflict.
  The reference type is the bank when the passbook is taken, and the value type is that the cash can be taken directly. 
  

Homework after class