Compilare: user.cpp: In function ‘int rotunda()’: user.cpp:20:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ('0' <= c[i] && c[i] <= '9') if ('0' <= c[i+1] && c[i+1] <= '9') p = (c[i] - '0') * 10 + c[i+1] - '0',i+=2;else p = c[i] - '0',++i;p*=f;++N; ^ user.cpp: In function ‘int patrata()’: user.cpp:41:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ('0' <= c[i] && c[i] <= '9') if ('0' <= c[i+1] && c[i+1] <= '9') p = (c[i] - '0') * 10 + c[i+1] - '0',i+=2;else p = c[i] - '0',++i;p*=f; ^ user.cpp: In function ‘int main()’: user.cpp:63:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ('0' <= c[i] && c[i] <= '9') if ('0' <= c[i+1] && c[i+1] <= '9') p = (c[i] - '0') * 10 + c[i+1] - '0',i+=2;else p = c[i] - '0',++i;++N; ^ user.cpp: In function ‘int patrata()’: user.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^