给一个不多于5位的正整数,要求:
1、求出它是几位数;
2、分别输出每一位数字
3、按逆序输出各位数字,例如原数为321,应输出123;
#include <stdio.h> //包含标准库的信息
#include <math.h> //<math.h> 头文件中声明了一些数学函数和宏
int main(void) //每个程序都从main函数的起点开始执行
{
int num,indiv,ten,hundred,thousand,ten_thousand,place;//数,个,十,百,千,万,位数
printf("请输入一个整数(0-99999)");
scanf("%d",&num);
if(num >9999)//大于9999且小于99999的数自然是5位数
place = 5;
else if (num >999)
place = 4;
else if (num > 99)
place = 3;
else if (num > 9)
place = 2;
else place = 1;
printf("位数:%d\n",place);
printf("每位数字为:");
ten_thousand = num/10000;//取万
thousand = (int)(num - ten_thousand * 10000)/1000;//把万减了,int是向下取整,得千位
hundred = (int)(num - ten_thousand * 10000 - thousand * 1000)/100;//同理
ten=(int)(num - ten_thousand * 10000 - thousand * 1000 - hundred * 100)/10;//同理
indiv=(int)(num - ten_thousand * 10000 - thousand * 1000 - hundred * 100 - ten * 10);//同理
switch (place)
{
case 5:
printf("%d,%d,%d,%d,%d",ten_thousand,thousand,hundred,ten,indiv);//把每位数显示出来
printf("\n反序数字为:");
printf("%d%d%d%d%d\n",indiv,ten,hundred,thousand,ten_thousand);//重新组合为倒序数
break;
case 4:
printf("%d,%d,%d,%d",thousand,hundred,ten,indiv);
printf("\n反序数字为:");
printf("%d%d%d%d\n",indiv,ten,hundred,thousand);
break;
case 3:
printf("%d,%d,%d",hundred,ten,indiv);
printf("\n反序数字为:");
printf("%d%d%d\n",indiv,ten,hundred);
break;
case 2:
printf("%d,%d",ten,indiv);
printf("\n反序数字为:");
printf("%d%d\n",indiv,ten);
break;
case 1:
printf("%d",indiv);
printf("\n反序数字为:");
printf("%d\n",indiv);
break;
}
return 0;
}
运行结果