View Compilation Error

0_0_17098464_22925.cpp:12:11: error: '::main' must return 'int'
 void main()
           ^
0_0_17098464_22925.cpp: In function 'int main()':
0_0_17098464_22925.cpp:22:23: error: 'memset' was not declared in this scope
   memset(v,0,sizeof(v));
                       ^