Compilare: user.cpp: In function ‘int main()’: user.cpp:10:36: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(f>>noskipws>>c){if(c>='A'&&c<='z'||c>='0'&&c<='9')lm++; ^ user.cpp:11:44: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] else if(d>='A'&&d<='z'||d>='0'&&d<='9')l++; ^