数字倒序，请问为什么输不出结果，顺便问一下有什么简便的方法吗？

Question

#include<stdio.h>
int main() {
int number1,number2,a,b,c,count;
scanf("%d",&number1);
do {
number2=number1/10;
count++;
} while(number2!=0);
switch(count) {
case 1:
printf("%d",number1);
break;
case 2:
a=number1/100;
b=number1%100/10;
printf("%d%d",b,a);
break;
case 3:
a=number1/100;
b=number1%100/10;
c=number1%10;
printf("%d%d%d",c,b,a);
break;}
return 0;}

Answer 1

不考虑负数

#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    while(n > 0){
        printf("%d",n % 10);
        n /= 10;
    }
    return 0;
}