View Compilation Error

0_0_22150053_30583.cpp: In function 'int main()':
0_0_22150053_30583.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 j,i=0,a,b,c[10000];
  ^
0_0_22150053_30583.cpp:5:22: error: 'a' was not declared in this scope
  while(scanf("%64d",&a)!=EOF)
                      ^