What is the difference between call by value & call by reference - sjj

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In this programme only variable names are similar, but their memory address are different and stored in different memory locations. Skip to content. In Call by value, a copy of the variable is passed whereas in Call by reference, a variable itself is passed. In Call by value, actual and formal arguments will be created in different memory locations whereas in Call by reference, actual and formal arguments will be created in the same memory location.

Call by Value, variables are passed using a straightforward method whereas Call by Reference, pointers are required to store the address of variables.

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Big Data Expand child menu Expand. Live Project Expand child menu Expand. If there is any modification to the formal parameter in a function code, it will not modify the original value of the argument which is used to call that function. The primary benefit of employing the call by value method is that the data passed through variables does not change the actual data. The reason behind this is that the changes applied to the variables inside the functions reflects only to the function copy of the argument value and the original value of the argument remains unchanged.

Now, as function code has obtained the address of an argument, the modification in the value of an argument will also modify the original value of an argument. The reference method uses reference variables which permits us to pass the parameters to the function. In this method, the calling of a function by reference creates an alias of the formal parameters to the actual parameters.

So, this signifies that the called function does not create its own copy of values. Instead, it refers to the original values with the help of reference names. Therefore, the function deals with original data and the changes employed to the original data are reflected back in the referenced data.

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