When is the call by reference method used? - Find 4 Answers & Solutions

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Question: When is the call by reference method used?

Posted by: Poojaagrawal on: 19 Nov, 2015

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Answer

It is used when you want to make changes in the actual variable and do not want to make a copy of variables and work on them

best example is that of swapping two numbers

main() { int x, y, temp; printf("Enter the value of x and y\n"); scanf("%d%d", &x, &y); printf("Before Swapping\nx = %d\ny = %d\n",x,y); temp = x; x = y; y = temp; printf("After Swapping\nx = %d\ny = %d\n",x,y); }

Answer by:

Blazingminds Learning Centre, Gurgaon

Answer

To Dynamically call different functions depending on requirements.

Answer by:

Sunil, Mumbai

Answer

When a function make some changes in formal parameter and we want these changes back to actual variable which are passed to the function as argument, then we use call by reference method

Supose we passed a variable A as argument to a function MODIFY(A) , and we want back any modification done in A by function MODIFY, then we need to pass A into function MODIFY by reference.

Answer by:

Mohammad Arif, Dehradun

Answer

The call by reference method of passing arguments to a function copies the address of an argument into the formal parameter. Inside the function, the address is used to access the actual argument used in the call. It means the changes made to the parameter affect the passed argument.

To pass a value by reference, argument pointers are passed to the functions just like any other value. So accordingly you need to declare the function parameters as pointer types as in the following function swap(), which exchanges the values of the two integer variables pointed to, by their arguments.

Answer by:

Pradeesh Chowraa P, Chennai

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