Compilare: user.cpp: In function ‘int main()’: user.cpp:14:17: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(buf[i]>='a'&&buf[i]<='z'||buf[i]>='A'&&buf[i]<='Z'){ ^ user.cpp:12:6: warning: unused variable ‘n’ [-Wunused-variable] int n,i,num=0,cuv=0,c=0; ^