View Compilation Error

0_0_3273704_28815.cpp: In function `int main()':
0_0_3273704_28815.cpp:9: error: `_int64' undeclared (first use this function)
0_0_3273704_28815.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3273704_28815.cpp:9: error: expected `;' before "f"
0_0_3273704_28815.cpp:13: error: `f' undeclared (first use this function)
0_0_3273704_28815.cpp:13: error: `f1' undeclared (first use this function)
0_0_3273704_28815.cpp:17: error: `f2' undeclared (first use this function)