View Compilation Error

0_0_28506210_13933.cpp: In function 'int main()':
0_0_28506210_13933.cpp:6:26: error: 'year' was not declared in this scope
  while(scanf("%d/%d/%d",&year,&month,&day)!=EOF)
                          ^
0_0_28506210_13933.cpp:6:32: error: 'month' was not declared in this scope
  while(scanf("%d/%d/%d",&year,&month,&day)!=EOF)
                                ^
0_0_28506210_13933.cpp:6:39: error: 'day' was not declared in this scope
  while(scanf("%d/%d/%d",&year,&month,&day)!=EOF)
                                       ^