如何用scanf输入学号,像下面这样?答:int a,b,c,d;printf("input stu number: 21110100\n");scanf("%2d%2d%2d%2d",&a,&b,&c,&d);a = 2000+a;printf("year:%d\n",a);printf("sp number:%02d\n",b);printf("class:%02d\n",c);printf("ser number:%02d\n",d);system("pause");return 0;} 输出字符,可以改写...