View Compilation Error

0_0_37118092_767.cpp:4:11: error: '::main' must return 'int'
 void main()
           ^
0_0_37118092_767.cpp: In function 'int main()':
0_0_37118092_767.cpp:9:23: error: 'memset' was not declared in this scope
   memset(x,0,sizeof(x));
                       ^