View Compilation Error

0_0_27440212_3982.cpp: In function 'int main()':
0_0_27440212_3982.cpp:5:29: error: 'year' was not declared in this scope
     while(scanf("%d/%d/%d",&year,&mouth,&day) != EOF)
                             ^
0_0_27440212_3982.cpp:5:35: error: 'mouth' was not declared in this scope
     while(scanf("%d/%d/%d",&year,&mouth,&day) != EOF)
                                   ^
0_0_27440212_3982.cpp:5:42: error: 'day' was not declared in this scope
     while(scanf("%d/%d/%d",&year,&mouth,&day) != EOF)
                                          ^
0_0_27440212_3982.cpp:7:6: error: 'sum' was not declared in this scope
      sum=0;
      ^
0_0_27440212_3982.cpp:19:40: error: expected primary-expression before '||' token
             case 2:if(a%4==0&&a%100!=0)||(a%400==0)sum+=29; else sum+=28;
                                        ^