What is meant by return by reference? How can we return values by reference by using reference variable? Illustrate with examples.

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A C++ function can return a reference in a similar way as it returns a pointer.

When a function returns a reference, it returns an implicit pointer to its return value. This way, a function can be used on the left side of an assignment statement.

The syntax of return a reference is

dataType& functionName(parameters);

let’s take an example that will return a reference

#include <iostream>
using namespace std;

int number;

int& retByRef(){
    return number;
}

int main(){
    
	retByRef() = 2;

    cout << number;

	return 0;
}
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