View Compilation Error

221574_0_19894.cpp: In function `int main()':
221574_0_19894.cpp:5: error: `_int64' undeclared (first use this function)
221574_0_19894.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
221574_0_19894.cpp:5: error: expected `;' before "a"
221574_0_19894.cpp:7: error: `a' undeclared (first use this function)