View Compilation Error

0_0_25340098_19127.cpp: In function 'int main()':
0_0_25340098_19127.cpp:13:3: error: expected ';' before 'else'
   else if(b==4)
   ^
0_0_25340098_19127.cpp:31:7: error: expected primary-expression before '%' token
   e=a+%100;
       ^
0_0_25340098_19127.cpp:38:3: error: 'elsed' was not declared in this scope
   elsed=d; 
   ^