View Compilation Error

0_0_30821276_2437.cpp: In function 'int main()':
0_0_30821276_2437.cpp:9:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a));
                       ^
0_0_30821276_2437.cpp:37:3: error: 'cout' was not declared in this scope
   cout<<"Case #"<<++count<<' '<<sum<<endl;
   ^
0_0_30821276_2437.cpp:37:38: error: 'endl' was not declared in this scope
   cout<<"Case #"<<++count<<' '<<sum<<endl;
                                      ^