View Compilation Error

0_0_17556016_5490.cpp: In function 'int main()':
0_0_17556016_5490.cpp:9:3: error: expected primary-expression before '%' token
  {%100!=0)||year%400==0)
   ^
0_0_17556016_5490.cpp:15:2: error: 'else' without a previous 'if'
  else
  ^
0_0_17556016_5490.cpp:17:4: error: 'sum' was not declared in this scope
    sum+=Year[i];
    ^
0_0_17556016_5490.cpp:18:2: error: 'sum' was not declared in this scope
  sum+=day;}
  ^
0_0_17556016_5490.cpp:19:7: error: 'sum' was not declared in this scope
 cout<<sum<<endl;
       ^