0_0_9956787_4913.cpp: In function `int main()':
0_0_9956787_4913.cpp:15: error: `fun' undeclared (first use this function)
0_0_9956787_4913.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9956787_4913.cpp: At global scope:
0_0_9956787_4913.cpp:28: error: ISO C++ forbids declaration of `fun' with no type
0_0_9956787_4913.cpp: In function `int fun(long int, long int)':
0_0_9956787_4913.cpp:28: error: `int fun(long int, long int)' used prior to declaration
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