从键盘输入三个数，按从小到大顺序输出。编译成功了，但就是不能实现交换的结果。

#include "stdio.h"

main()
{
int a,b,c;
int temp1,temp2;
printf("please enter three numbers:\n");
scanf("%d,%d,%d",&a,&b,&c);
if(a>b)
  if(a>c)
    if(b>c)
    {
    temp1=b;
    b=c;
    c=temp1;
    }
    else if(b<c)
         {
         temp1=a;
         a=b;
         c=temp1;
         temp2=c;
         b=temp2;
         }
  else if(a<c)
       {
        temp1=a;
        a=b;
        b=temp1;
       }
else if(a<b)
       if(a>c)
       {
         temp1=a;
         a=c;
         temp2=b;
         b=temp1;
         c=temp2;
       }
       else if(a<c)
              if(b>c)
              {
                temp1=a;
                a=b;
                temp2=c;
                c=temp1;
                b=temp2;
              }


              else
printf("%d<%d<%d",a,b,c);


        getch();
}

求详细解释！！

谢谢了哈！@！