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<<end|;   //1 2 3
      |                         ^~~~
foo.c:9:50: error: ‘end’ undeclared (first use in this function)
    9 |                         cout<<a<<"<"<<b<<"<"<<c<<end|;   //1 2 3
      |                                                  ^~~
foo.c:9:54: error: expected expression before ‘;’ token
    9 |                         cout<<a<<"<"<<b<<"<"<<c<<end|;   //1 2 3
      |                                                      ^
foo.c:13:62: error: expected expression before ‘;’ token
   13 |                                 cout<<a<<"<"<<c<<"<"<<b<<end|; //1 3 2
      |                                                              ^
foo.c:23:62: error: expected expression before ‘;’ token
   23 |                                 cout<<b<<"<"<<c<<"<"<<a<<end|; //3 1 2
      |                                                              ^
foo.c:5:20: warning: unused variable ‘min’ [-Wunused-variable]
    5 |         int a,b,c, min;
      |                    ^~~