“enumeration value ‘xxxxx‘ not handled in switch“警告

typedef enum
{
    HE=0,
    SH
}PARAM_TYPE;

void fun(PARAM_TYPE pe)
{

    switch (pe) {
    case HE:
        cout<<"he"<<endl;
        break;
    }
}

原因没有加default,修改后

void fun(PARAM_TYPE pe)
{

    switch (pe) {
    case HE:
        cout<<"he"<<endl;
        break;
    default:
        break;
    }
}