View Compilation Error

231308_0_21766.cpp: In function `int main()':
231308_0_21766.cpp:4: error: `_int64' undeclared (first use this function)
231308_0_21766.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
231308_0_21766.cpp:4: error: expected `;' before "a"
231308_0_21766.cpp:7: error: `a' undeclared (first use this function)