Compilare: user.cpp: In function ‘int main()’: user.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ^ user.cpp:15:13: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')sum++; ^ user.cpp:17:15: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i-1]>='a'&&s[i-1]<='z'||s[i-1]>='A'&&s[i-1]<='Z')nr++; ^