# include <stdio.h>

void main()
{
	int num;
	/* 下面定義的各變量，分別代表個位，十位，百位，千位，萬位，十萬位以及位數 */
	int indiv, ten, hundred, thousand; 
	int  place;

	printf("請輸入一個整數(0～9999)：");
	scanf("%d", &num);

	/* 判斷變量num的位數 */
       if(num > 999)
		place = 4;
	else if(num > 99)
		place = 3;
	else if(num > 9)
		place = 2;
	else
		place = 1;
	printf("place = %d\n", place);
	
	printf("每位數字為：");

	/* 求出num在各位上的值 */
	
     thousand = num/1000;
	hundred = (num - thousand*1000)/100;
	ten = (num  - thousand*1000 - hundred*100)/10;
	indiv = num - thousand*1000 - hundred*100 - ten*10;

	/* 判斷變量num的位數，并根據位數做出相應的輸出 */
	switch(place)
	{
	case 1: printf("%d", indiv);
		    break;
    case 2: printf("%d, %d", ten, indiv);
		    break;
	case 3: printf("%d, %d, %d", hundred, ten, indiv);
		    break;
	case 4: printf("%d, %d, %d, %d", thousand, hundred, ten, indiv);
		    break;
	
	}
}