View Compilation Error

0_0_17555704_16875.cpp: In function 'int main()':
0_0_17555704_16875.cpp:4:13: error: '_int64' was not declared in this scope
 #define pro _int64
             ^
0_0_17555704_16875.cpp:14:3: note: in expansion of macro 'pro'
   pro a[4];
   ^
0_0_17555704_16875.cpp:17:19: error: 'a' was not declared in this scope
    scanf("%I64d",&a[i]);
                   ^
0_0_17555704_16875.cpp:19:8: error: 'a' was not declared in this scope
   sort(a,a+4);
        ^