/in/ex1_2.cpp: In function 'void charCheck(char)':
/in/ex1_2.cpp:13:21: error: 'a' was not declared in this scope
     for (int i=0; i<a.length  ;i++)
                     ^
/in/ex1_2.cpp:11:9: warning: unused variable 'arr' [-Wunused-variable]
     int arr[10];
         ^~~
/in/ex1_2.cpp:4:21: warning: unused parameter 'input_char' [-Wunused-parameter]
 void charCheck(char input_char)
                     ^~~~~~~~~~