Compilare: user.cpp: In function ‘void suma(char*, char*, char*)’: user.cpp:7:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=f1[i]+f2[i]+z; ^ user.cpp:7:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=f1[i]+f2[i]+z; ^ user.cpp:8:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] f3[i]=x%10; ^ user.cpp: In function ‘int main()’: user.cpp:23:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=1;i<=f2[0];i++) f1[i]=f2[i]; ^ user.cpp:23:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=1;i<=f2[0];i++) f1[i]=f2[i]; ^ user.cpp:24:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=1;i<=f2[0];i++) f2[i]=f3[i]; ^ user.cpp:24:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=1;i<=f2[0];i++) f2[i]=f3[i]; ^ user.cpp:27:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=f1[0];i>=1;i--) fprintf(f,"%hhd",f1[i]); ^ user.cpp:18:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hhd",&n); ^