Compilare: main.cpp: In function 'int main()': main.cpp:24:12: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | fr[ch]=1-fr[ch]; | ^~ main.cpp:24:21: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | fr[ch]=1-fr[ch]; | ^~ main.cpp:80:38: warning: array subscript has type 'char' [-Wchar-subscripts] 80 | op[++vfop]=fr[s[i]]; | ~~~^ main.cpp: In function 'int calcul(int, int, int)': main.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type] 16 | } | ^