程序代码：

int GetRequirementFromKeyboard(void)
{
    int Requirement_Number=0;
    int flag=1;
    cout<<"enter a requiremnet-number:";
    cin>>Requirement_Number;
    while(flag)
    {
        
        if(Requirement_Number>0&&Requirement_Number<7)flag=0;//一次正确输入就跳出循环
        else 
        {
            cin.clear();
            cout<<"\nOut of rang,please enter a new requiemnet-number\n";
            cin>>Requirement_Number;
        }
                //输入为字母时死循环了，请问是怎么回事？
    }
    return Requirement_Number;
}

[此贴子已经被作者于2016-2-29 16:35编辑过]