View Compilation Error

47727_0_22431.cpp: In function `int main()':
47727_0_22431.cpp:8: error: `_int64' undeclared (first use this function)
47727_0_22431.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
47727_0_22431.cpp:8: error: expected `;' before "num"
47727_0_22431.cpp:10: error: expected `;' before "result"
47727_0_22431.cpp:13: error: `result' undeclared (first use this function)
47727_0_22431.cpp:17: error: `num' undeclared (first use this function)