View Compilation Error

785240_0_0_31248.cpp: In function `int main()':
785240_0_0_31248.cpp:7: error: `_int64' undeclared (first use this function)
785240_0_0_31248.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
785240_0_0_31248.cpp:7: error: expected `;' before "sum"
785240_0_0_31248.cpp:8: error: `num' undeclared (first use this function)
785240_0_0_31248.cpp:9: error: `sum' undeclared (first use this function)
785240_0_0_31248.cpp:30: error: `temp' undeclared (first use this function)