View Compilation Error

0_0_6315157_748.cpp: In function `int main()':
0_0_6315157_748.cpp:3: error: `_int64' undeclared (first use this function)
0_0_6315157_748.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6315157_748.cpp:3: error: expected `;' before "a"
0_0_6315157_748.cpp:4: error: `a' undeclared (first use this function)
0_0_6315157_748.cpp:6: error: `s' undeclared (first use this function)
0_0_6315157_748.cpp:7: error: `t' undeclared (first use this function)
0_0_6315157_748.cpp:12: error: `i' undeclared (first use this function)