foo.c: In function ‘main’:
foo.c:6:9: error: ‘cin’ undeclared (first use in this function); did you mean ‘min’?
    6 |         cin>>a>>b>>c;
      |         ^~~
      |         min
foo.c:6:9: note: each undeclared identifier is reported only once for each function it appears in
foo.c:9:25: error: ‘cout’ undeclared (first use in this function)
    9 |                         cout<<a<<"<"<<b<<"<"<<c<<endl;
      |                         ^~~~
foo.c:9:50: error: ‘endl’ undeclared (first use in this function)
    9 |                         cout<<a<<"<"<<b<<"<"<<c<<endl;
      |                                                  ^~~~
foo.c:5:16: warning: unused variable ‘min’ [-Wunused-variable]
    5 |     int a,b,c, min;
      |                ^~~