View Compilation Error

0_0_34558624_19237.cpp:4:12: error: '::main' must return 'int'
 float main()
            ^
0_0_34558624_19237.cpp: In function 'int main()':
0_0_34558624_19237.cpp:20:13: error: expected '}' at end of input
     return 0;
             ^