View Compilation Error

0_0_31058644_20607.cpp: In function 'int main()':
0_0_31058644_20607.cpp:42:9: error: expected '}' before 'else'
    --p; else --q;
         ^
0_0_31058644_20607.cpp:48:25: error: 'p' was not declared in this scope
   printf("%d\n",Catalan(p,q));
                         ^
0_0_31058644_20607.cpp:48:27: error: 'q' was not declared in this scope
   printf("%d\n",Catalan(p,q));
                           ^
0_0_31058644_20607.cpp: At global scope:
0_0_31058644_20607.cpp:50:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_31058644_20607.cpp:51:1: error: expected declaration before '}' token
 }
 ^