View Compilation Error

2_13622_912016_6101.cpp: In function `int main()':
2_13622_912016_6101.cpp:4: error: `_int64' undeclared (first use this function)
2_13622_912016_6101.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
2_13622_912016_6101.cpp:4: error: expected `;' before "k"
2_13622_912016_6101.cpp:5: error: `k' undeclared (first use this function)