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The main difference between pass by value and pass by reference is that, in a pass by value, the parameter value copies to another variable while, in a pass by reference, the actual parameter passes to the function.
In the case of Call by Value, when we pass the value of the parameter during the calling of the function, it copies them to the function's actual local argument. In the case of Call by Reference, when we pass the parameter's location reference/address, it copies and assigns them to the function's local argument.
Value parameters are the parameters that are passed by value. Passing parameters by value means that the function/procedure gets a copy of the parameters. The changes made to the parameter passed by value are not reflected in the original variable when the function/procedure returns.
Value parameters are used to pass information into a function. Reference parameters are used to pass information in and out of a function. We learn how to write functions that contain both of these types of parameters. Lastly, we discuss the usage of local variables in C++ programs. void Functions with No Parameters.
Difference between value parameter and reference parameter ? This question is asked sometime by interviewers during my interviews. Can someone tell me the exact difference that is easy to explain with example? And is reference parameter and pointer parameter are same thing ?
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