View Compilation Error

0_0_5990536_2607.cpp: In function `int main()':
0_0_5990536_2607.cpp:8: error: `_int64' undeclared (first use this function)
0_0_5990536_2607.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5990536_2607.cpp:8: error: expected `;' before "n"
0_0_5990536_2607.cpp:12: error: `n' undeclared (first use this function)
0_0_5990536_2607.cpp:14: error: expected `;' before "x"