C++ | References | Question 4
Predict the output of following C++ program.
#include<iostream>using namespace std; int &fun(){ static int x = 10; return x;}int main(){ fun() = 30; cout << fun(); return 0;} |
(A) Compiler Error: Function cannot be used as lvalue
(B) 10
(C) 30
Answer: (C)
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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