利用C语言判别用户输入数的位数并正逆序输出
#include <stdio.h>
void main()
{
int i, scanfNum, printfNum, temp = 1, total = 0;
printf("请输入不多于4位的正整数：");
scanf("%d", &scanfNum);
while(scanfNum > 9999 || scanfNum < 0)//可更改数据来调整所需判定的范围
{
printf("请重新输入一个不多于4位的正整数：");
scanf("%d", &scanfNum);
}
printfNum = scanfNum;
do
{
scanfNum /= 10;
total++;
}while(scanfNum != 0);
printf("%d是%d位数\n", printfNum, total);
scanfNum = printfNum;
for(i = 1; i < total; i++)temp *= 10;
do
{
printf("%-2d", scanfNum/temp);
scanfNum %= temp;
temp /= 10;
}while(temp != 0);
putchar('\n');
scanfNum = printfNum;
do
{
printf("%d", scanfNum%10);
scanfNum /= 10;
}while(scanfNum != 0);
putchar('\n');
}
