View Compilation Error

0_0_5384655_24845.cpp:6: error: `main' must return `int'
0_0_5384655_24845.cpp: In function `int main(...)':
0_0_5384655_24845.cpp:7: error: `_int64' undeclared (first use this function)
0_0_5384655_24845.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5384655_24845.cpp:7: error: expected `;' before "a"
0_0_5384655_24845.cpp:9: error: `a' undeclared (first use this function)
0_0_5384655_24845.cpp:9: error: `b' undeclared (first use this function)