View Compilation Error

0_0_30808566_14622.cpp: In function 'int main()':
0_0_30808566_14622.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 a,b,c;
  ^
0_0_30808566_14622.cpp:6:33: error: 'a' was not declared in this scope
  while(scanf("%I64d%I64d%I64d",&a,&b,&c),a+b+c)
                                 ^
0_0_30808566_14622.cpp:6:36: error: 'b' was not declared in this scope
  while(scanf("%I64d%I64d%I64d",&a,&b,&c),a+b+c)
                                    ^
0_0_30808566_14622.cpp:6:39: error: 'c' was not declared in this scope
  while(scanf("%I64d%I64d%I64d",&a,&b,&c),a+b+c)
                                       ^