View Compilation Error

0_0_33210395_842.cpp:5:11: error: '::main' must return 'int'
 void main()
           ^
0_0_33210395_842.cpp: In function 'int main()':
0_0_33210395_842.cpp:19:29: error: 'memset' was not declared in this scope
     memset(ary,0,sizeof(ary));
                             ^