View Compilation Error

0_0_8232353_12673.cpp: In function `int main()':
0_0_8232353_12673.cpp:5: error: `_int64' undeclared (first use this function)
0_0_8232353_12673.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8232353_12673.cpp:5: error: expected `;' before "a"
0_0_8232353_12673.cpp:6: error: `n' undeclared (first use this function)
0_0_8232353_12673.cpp:8: error: `i' undeclared (first use this function)
0_0_8232353_12673.cpp:10: error: `a' undeclared (first use this function)
0_0_8232353_12673.cpp:11: error: `j' undeclared (first use this function)
0_0_8232353_12673.cpp:13: error: `num' undeclared (first use this function)