#include <stdio.h>
main()
｛int a,b,c,d,e;
b=5,c=8,d=12,e=24;
printf("enter one\n");
 scanf("%d",&a);
 if(a<b)
{
     printf("123\n");
}  
 else if(b<=a<c)
{         
     printf("456\n");
}
 else if(c<=a<d)
{   
     printf("789\n");
}
 else if(d<=a<=e)
{
     printf("000\n");
}
｝
为啥选择不出呢...且请一名老师...本人是新手中的新手...刚刚才接触的C语言的...

各位谢谢拉...我完全是新手来的...所以很多基础都还不懂...没想过用与...