/in/foo.cc: In function 'void init()':
/in/foo.cc:8:6: error: 'memset' was not declared in this scope
    8 |      memset(f,0,sizeof(f));
      |      ^~~~~~
/in/foo.cc:2:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>