View Compilation Error

0_0_3084264_27889.cpp: In function `int main()':
0_0_3084264_27889.cpp:6: error: `int64' undeclared (first use this function)
0_0_3084264_27889.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3084264_27889.cpp:6: error: expected `;' before "a"
0_0_3084264_27889.cpp:8: error: `a' undeclared (first use this function)