判断一个五位数a是否是回文数，不正确的语句是_____________

A、if (a/10000==a%10 and a/1000%10==a/10%10)printf("yes");
B、if (a/10000%10==a/1%10 and a/1000%10==a/10%10)printf("yes");
C、if (a%10000==a%10 and a%1000==a%10)printf("yes");
D、if (a-a%10000==a%10*10000 and (a-a%1000)%10==a/10%10)printf("yes");