#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>
int main()
{
	int i,j = 0;
	int a1,a2,a3,a4;
	printf("输入一个4位正整数：\n");
	scanf("%d",&i);
	a1 = i/1000;		
	a2 = i/100%10;	
	a3 = i/10%10;		
	a4 = i%10;		
	printf("千位a1=%d,百位a2=%d,十位a3=%d,个位a4=%d\n",a1,a2,a3,a4);
	j = 1000*a4 + 100*a3 + 10*a2 + a1;
	printf("逆数j=%d\n",j);
	
	return 0;
}