Question

Explain two methods of passing arguments to function with example.

Answer 1

Call by value

Call by reference

Answer 2

The two methods of passing arguments to function are call by value and call be reference.

Call by value:

• When a function is called by value, the actual values to be processed are passed to the calling function.
• With this technique, an argument's value is copied into the function's formal parameters.
• To pass arguments, the C programming language by default employs the call by value mechanism.

Call by reference :

• When a function is called by reference, the calling function calls the function and passes the address of the real values to be processed.
• This method copies an argument's address into the parameter.
• The address is utilised inside the subroutine to obtain the call's real argument.

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