#include<stdio.h>
void?main()
{
	int?i,n;
	do{
		printf("請輸入一個正整數：");
		scanf("%d",&n);
		if(n<=0)
		{
			printf("數據錯誤，請重新輸入!!\n");
		}
	}while(n<=0);
	printf("逆序輸出:");
	for(i=0;n>0;i++)
	{
		printf("??%d",n%10);
		n=n/10;
	}
	printf("\n這是一個%d位數\n",i);

	

}

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