/in/foo.cc: In function 'int main()':
/in/foo.cc:17:18: warning: 'a' is used uninitialized [-Wuninitialized]
   17 |     cout<<s(a,b,c);
      |                  ^
/in/foo.cc:16:9: note: 'a' was declared here
   16 |     int a,b,c;
      |         ^
/in/foo.cc:17:18: warning: 'b' is used uninitialized [-Wuninitialized]
   17 |     cout<<s(a,b,c);
      |                  ^
/in/foo.cc:16:11: note: 'b' was declared here
   16 |     int a,b,c;
      |           ^
/in/foo.cc:17:18: warning: 'c' is used uninitialized [-Wuninitialized]
   17 |     cout<<s(a,b,c);
      |                  ^
/in/foo.cc:16:13: note: 'c' was declared here
   16 |     int a,b,c;
      |             ^