View Compilation Error

0_0_24233243_7623.cpp: In function 'int main()':
0_0_24233243_7623.cpp:17:27: error: expected ';' before ':' token
  memset(num,0,sizeof(num)):
                           ^
0_0_24233243_7623.cpp:18:14: error: 'i' was not declared in this scope
  for(int i=1;i<=1000000;i++){
              ^