Compilare: main.cpp: In function 'int read_int()': main.cpp:57:22: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | while(!isDigit[c = read_char()]); | ~~^~~~~~~~~~~~~ main.cpp:63:21: warning: array subscript has type 'char' [-Wchar-subscripts] 63 | while(isDigit[c = read_char()]); | ~~^~~~~~~~~~~~~