Compilare: user.cpp: In function ‘int main()’: user.cpp:56:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (tof[chr]==1) ^ user.cpp:57:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] tof[chr]=0; ^ user.cpp:59:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] tof[chr]=1; ^ user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<strlen(s); j++) { ^ user.cpp:72:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] tmp[++k]='0' + tof[s[j]]; ^