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What is the difference between call …

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What is the difference between call by value and call by reference

Posted by Sai Thaini 3 years, 5 months ago

CBSE > Class 12 > Computer Science

1 answers

Sia ? 3 years, 5 months ago

Parameters	Call by value	Call by reference
Definition	While calling a function, when you pass values by copying variables, it is known as "Call By Values."	While calling a function, in programming language instead of copying the values of variables, the address of the variables is used it is known as "Call By References.
Arguments	In this method, a copy of the variable is passed.	In this method, a variable itself is passed.
Effect	Changes made in a copy of variable never modify the value of variable outside the function.	Change in the variable also affects the value of the variable outside the function.
Alteration of value	Does not allow you to make any changes in the actual variables.	Allows you to make changes in the values of variables by using function calls.
Passing of variable	Values of variables are passed using a straightforward method.	Pointer variables are required to store the address of variables.
Value modification	Original value not modified.	The original value is modified.
Memory Location	Actual and formal arguments will be created in different memory location	Actual and formal arguments will be created in the same memory location
Safety	Actual arguments remain safe as they cannot be modified accidentally.	Actual arguments are not Safe. They can be accidentally modified, so you need to handle arguments operations carefully.
Default	Default in many programming languages like C++.PHP. Visual Basic NET, and C#.	It is supported by most programming languages like JAVA, but not as default.

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