Compilare: user.cpp: In function ‘int main()’: user.cpp:16:19: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s>='a' && s<='z' || s>='A' && s<='Z') ^ user.cpp:10:14: warning: unused variable ‘d’ [-Wunused-variable] int c=0, d, l=0, n=0, i=1, ok=0; ^ user.cpp:10:22: warning: unused variable ‘n’ [-Wunused-variable] int c=0, d, l=0, n=0, i=1, ok=0; ^ user.cpp:10:27: warning: unused variable ‘i’ [-Wunused-variable] int c=0, d, l=0, n=0, i=1, ok=0; ^