View Compilation Error

164811_0_16139.cpp: In function `int main()':
164811_0_16139.cpp:5: error: `_int64' undeclared (first use this function)
164811_0_16139.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
164811_0_16139.cpp:5: error: expected `;' before "a"
164811_0_16139.cpp:7: error: `a' undeclared (first use this function)