CALL BY VALUE AND REFERENCE--

A function can be called by two types

1) Call By Value:-

when an original value is not modified , is known as call by value.
In call by value the actual parameter(the parameter passed to function) is copied into the formal parameter(parameter receive by function).
in this the value of each variable in calling function is copied into the corresponding dummy variable of the called function.
the changes made to the dummy variable have no effect on the actual variable.
Example:-

2)Call By Reference:-

when an original value is modified, is known as call by reference.in this a reference is used , denoted by &(symbol).
we can use either pointer or reference for call by reference
in this the address of the variable is passed into the function called by actual parameter.
in this the memory allocation is same for both actual and formal arguments.
Example:-

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