View Compilation Error

0_0_7749153_13488.cpp: In function `int fac(int)':
0_0_7749153_13488.cpp:4: error: `_int64' undeclared (first use this function)
0_0_7749153_13488.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7749153_13488.cpp:4: error: expected `;' before "d"
0_0_7749153_13488.cpp:6: error: `d' undeclared (first use this function)