View Compilation Error

0_0_27440245_15874.cpp: In function 'int main()':
0_0_27440245_15874.cpp:5:23: error: 'year' was not declared in this scope
     scanf("%d/%d/%d",&year,&mouth,&day);
                       ^
0_0_27440245_15874.cpp:5:29: error: 'mouth' was not declared in this scope
     scanf("%d/%d/%d",&year,&mouth,&day);
                             ^
0_0_27440245_15874.cpp:5:36: error: 'day' was not declared in this scope
     scanf("%d/%d/%d",&year,&mouth,&day);
                                    ^
0_0_27440245_15874.cpp:6:6: error: 'sum' was not declared in this scope
      sum=0;
      ^
0_0_27440245_15874.cpp:18:46: error: expected primary-expression before '||' token
             case 2:if(year%4==0&&year%100!=0)||(year%400==0)sum+=29; else sum+=28;
                                              ^