struct stu
{
    int xh;
    char xm[10];
    float cj;
}x[61]={0,"",0};
int num;

void Inputnjxx(char nj[]) // 年级
{
    time_t timer; 
    struct tm *tblock; 
    int year;
    timer=time(NULL); // 获取机器的日期
    tblock=localtime(&timer); 
    year=tblock->tm_year+1900;
    if(tblock->tm_mon<8)
    {
        do
        {
            cout<<"   请输入年级("<<year-1<<"或";
            cout<<year-2<<"或";
            cout<<year-3<<")：";
            cin>>nj;
            if(atoi(nj)>year-1 || atoi(nj)<year-3)
                cout<<"      年级越界！请重新输入！\n";
        }while(atoi(nj)>year-1 || atoi(nj)<year-3 );