Compilare: user.cpp: In function ‘int main()’: user.cpp:19:23: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if('a'<=x[l-1]&&x[l-1]<='z'||'A'<=x[l-1]&&x[l-1]<='Z'||x[l-1]==',') ^ user.cpp:26:23: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if('a'<x[l-2]<'z'||'A'<x[l-2]<'Z') ^ user.cpp:26:39: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if('a'<x[l-2]<'z'||'A'<x[l-2]<'Z') ^ user.cpp:29:27: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if('a'<x[l-4]<'z'||'A'<x[l-4]<'Z') ^ user.cpp:29:43: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if('a'<x[l-4]<'z'||'A'<x[l-4]<'Z') ^