Compilare: main.cpp: In function 'void init()': main.cpp:6:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] void init(){for(int i = 0; i < base64Chars.size(); i++) b64dval[base64Chars[i]] = i;} ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:6:79: warning: array subscript has type 'char' [-Wchar-subscripts] void init(){for(int i = 0; i < base64Chars.size(); i++) b64dval[base64Chars[i]] = i;} ^ main.cpp: In function 'int b64dtob10(char)': main.cpp:7:43: warning: array subscript has type 'char' [-Wchar-subscripts] int b64dtob10(char ch) { return b64dval[ch]; } ^