View Compilation Error

0_0_13763415_10402.cpp:7:11: error: '::main' must return 'int'
 void main()
           ^
0_0_13763415_10402.cpp: In function 'int main()':
0_0_13763415_10402.cpp:27:28: error: expected unqualified-id before ';' token
   double result= happyTime.;
                            ^