View Compilation Error

0_0_4901030_14475.cpp:2: error: `_int64' does not name a type
0_0_4901030_14475.cpp: In function `int main()':
0_0_4901030_14475.cpp:6: error: `_int64' undeclared (first use this function)
0_0_4901030_14475.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4901030_14475.cpp:6: error: expected `;' before "t"
0_0_4901030_14475.cpp:7: error: `t' undeclared (first use this function)
0_0_4901030_14475.cpp:10: error: expected `;' before "A"
0_0_4901030_14475.cpp:11: error: `A' undeclared (first use this function)
0_0_4901030_14475.cpp:11: error: `B' undeclared (first use this function)
0_0_4901030_14475.cpp:12: error: `sum' undeclared (first use this function)