View Compilation Error

0_0_14542951_1243.cpp: In function 'int main()':
0_0_14542951_1243.cpp:5:2: error: '__int64' was not declared in this scope
  __int64 a,b,x,y;
  ^
0_0_14542951_1243.cpp:6:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_14542951_1243.cpp:10:3: error: 'a' was not declared in this scope
   a=b=0;
   ^
0_0_14542951_1243.cpp:10:5: error: 'b' was not declared in this scope
   a=b=0;
     ^
0_0_14542951_1243.cpp:13:24: error: 'x' was not declared in this scope
    scanf("%I64d%I64d",&x,&y);
                        ^
0_0_14542951_1243.cpp:13:27: error: 'y' was not declared in this scope
    scanf("%I64d%I64d",&x,&y);
                           ^
0_0_14542951_1243.cpp:23:25: error: 'printf' was not declared in this scope
   printf("Case %d: ",++c);
                         ^