Predict the output of following C++ program.
(A) Compiler Error: Function cannot be used as lvalue
Explanation: When a function returns by reference, it can be used as lvalue. Since x is a static variable, it is shared among function calls and the initialization line “static int x = 10;” is executed only once.
The function call fun() = 30, modifies x to 30. The next call “cout << fun()" returns the modified value.
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