View Compilation Error

0_0_9796303_557.cpp:3: error: `_int64' does not name a type
0_0_9796303_557.cpp: In function `int main()':
0_0_9796303_557.cpp:8: error: `c' undeclared (first use this function)
0_0_9796303_557.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)