View Compilation Error

0_0_9072182_17555.cpp: In function `int main()':
0_0_9072182_17555.cpp:3: error: `_int64' undeclared (first use this function)
0_0_9072182_17555.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9072182_17555.cpp:3: error: expected `;' before "x"
0_0_9072182_17555.cpp:4: error: `x' undeclared (first use this function)
0_0_9072182_17555.cpp:4: error: `y' undeclared (first use this function)
0_0_9072182_17555.cpp:5: error: `a' undeclared (first use this function)