Explain call by value and call by reference, Computer Engineering

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Call by value and Call by reference

Call by value means sending the values of the arguments- The value of each of the original arguments in the calling function is copied into corresponding formal arguments of the called function. The modification made to the formal arguments has no effect on the values of actual arguments in the calling function.  This method of passing arguments is called call by value verified by swap (int x, int y) function in the following example. 

Call by reference means sending the addresses of the arguments- the addresses of actual arguments in the calling function are copied into formal arguments of the called function. Using these addresses we are really working on actual argument so changes will be reflected in the calling function.

 


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