Difference Between call by value and call by reference

Difference Between call by value and call by reference

Call By Value	Call By Reference
Call by value return the value to the main function	Call by reference return the address to the main function.
Change in the sub function does not reflect to the main function	Change in the sub function reflects to the main function.
It can return only one value of variable.	It can return more than one value of variables  because it return reference
In Function call value is passed.	In Function call address is passed.
C and Java restrict themselves to Call by Value.	C++ and Pascal let you declare that a parameter is a reference.
Value of actual parameter is used to initialize the formal parameter.	Formal parameter refers to the same memory cell for the actual     parameter.