Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:12:23: error: ‘strlen’ was not declared in this scope for(i=0;i<strlen(a);i++) ^ user.cpp:13:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z')) ^ user.cpp:13:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z')) ^ user.cpp:13:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z')) ^ user.cpp:13:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z')) ^