P51 19

#include<stdio.h>

int main()
{
unsigned int x,flag;
while(1)
{
printf("请输入一个数:\n");
scanf("%d",&x);
do
{
flag = x%2;
x = x/10;
}
while(x!=0&&(!flag)==x%2);
if(x==0) printf("YES\n");
else printf("NOT\n");
}
return 0;
}