View Compilation Error

0_0_34756543_3461.cpp: In function 'int main()':
0_0_34756543_3461.cpp:17:39: error: 'sum' was not declared in this scope
   printf("Case %d: %.2lf\n\n", ++cnt, sum / B);
                                       ^
0_0_34756543_3461.cpp: At global scope:
0_0_34756543_3461.cpp:19:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_34756543_3461.cpp:20:1: error: expected declaration before '}' token
 } 
 ^