What is the difference between call by reference and call by value when it comes toMemory usageFunction parameter data typesAccess to variables sent as parameters

Answered: What is the difference between call by…

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 8RQ

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What is the difference between call by reference and call by value when it comes to
1. Memory usage
2. Function parameter data types
3. Access to variables sent as parameters

Expert Solution

Step 1

There are two methodology found in the programming language to call a function: -

Call by value
Call by reference

Call by value: -

In this methodology of passing parameters, values of real parameters are copied to the formal parameters of the function, and the two kinds of parameters are stored in separate locations of memory. Thus any modifications made within functions are not expressed in actual caller parameters.

Call by reference: -

In this methodology, the reference (address) of an argument replicas into the formal parameter. In this process the address is used to access the actual parameter used in the call to function. It implies that the modifications made to the parameter change the passing argument.

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