View Compilation Error

472449_0_0_15925.cpp: In function `int main()':
472449_0_0_15925.cpp:6: error: `_int64' undeclared (first use this function)
472449_0_0_15925.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
472449_0_0_15925.cpp:6: error: expected `;' before "num"
472449_0_0_15925.cpp:8: error: `num' undeclared (first use this function)