View Compilation Error

220223_0_19421.cpp: In function `int main()':
220223_0_19421.cpp:5: error: `_int64' undeclared (first use this function)
220223_0_19421.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
220223_0_19421.cpp:5: error: expected `;' before "a"
220223_0_19421.cpp:6: error: `a' undeclared (first use this function)