/in/foo.c: In function 'main':
/in/foo.c:5:9: error: 'cin' undeclared (first use in this function)
    5 |         cin>>xmin>>xmax;
      |         ^~~
/in/foo.c:5:9: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:6:36: error: expected ';' before 'int'
    6 |         scanf("%d %d",&xmin, &xmax)
      |                                    ^
      |                                    ;
    7 |         int digitCount[10] = {0};
      |         ~~~                         
/in/foo.c:9:9: warning: implicit declaration of function 'countDigits' [-Wimplicit-function-declaration]
    9 |         countDigits(i, digitCount);
      |         ^~~~~~~~~~~
/in/foo.c:9:24: error: 'digitCount' undeclared (first use in this function)
    9 |         countDigits(i, digitCount);
      |                        ^~~~~~~~~~
/in/foo.c:19:9: error: 'cout' undeclared (first use in this function)
   19 |         cout<<"%d\n", mostFrequentDigit<<endl;
      |         ^~~~
/in/foo.c:19:42: error: 'endl' undeclared (first use in this function)
   19 |         cout<<"%d\n", mostFrequentDigit<<endl;
      |                                          ^~~~
/in/foo.c:19:21: warning: left-hand operand of comma expression has no effect [-Wunused-value]
   19 |         cout<<"%d\n", mostFrequentDigit<<endl;
      |                     ^