View Compilation Error

409897_0_0_29854.cpp: In function `int main()':
409897_0_0_29854.cpp:6: error: `_int64' undeclared (first use this function)
409897_0_0_29854.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
409897_0_0_29854.cpp:6: error: expected `;' before "a"
409897_0_0_29854.cpp:7: error: `a' undeclared (first use this function)