View Compilation Error

0_0_19754386_14472.cpp:2:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_19754386_14472.cpp: In function 'int main()':
0_0_19754386_14472.cpp:14:5: error: expected ';' before 'double'
     double t = p+q;
     ^
0_0_19754386_14472.cpp:14:5: error: expected primary-expression before 'double'
0_0_19754386_14472.cpp:14:5: error: expected ')' before 'double'
0_0_19754386_14472.cpp:16:7: error: 't' was not declared in this scope
     q=t;
       ^
0_0_19754386_14472.cpp:16:8: error: expected '}' at end of input
     q=t;
        ^
0_0_19754386_14472.cpp:16:8: error: expected '}' at end of input
0_0_19754386_14472.cpp:16:8: error: expected '}' at end of input