#include<stdio.h>
void main()
{
	int num, count=0;
	printf("\n請輸入數字：\n");
	scanf("%d",&num);
	do
	{
		num = num / 10;/* 提取該數的位數 */
		count ++;
	}while (num >0); /* do...while 循環結束 */
	printf("\n該數的位數是 %d\n",count);
}