0_0_1978419_7799.cpp:2: error: expected constructor, destructor, or type conversion before ';' token
0_0_1978419_7799.cpp:4: error: `main' must return `int'
0_0_1978419_7799.cpp: In function `int main(...)':
0_0_1978419_7799.cpp:7: error: `fun' undeclared (first use this function)
0_0_1978419_7799.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1978419_7799.cpp: In function `int fun(int, int, int)':
0_0_1978419_7799.cpp:10: error: `int fun(int, int, int)' used prior to declaration
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