想问问C中这个【深基2.例7】数字反转怎么编

#include<stdio.h>
int main()
{
    double number;
    int num;
    double out=0;
    scanf("%lf",&number);
    num=number*10;
    while(num>0){
        out=out*10+num%10;
        num/=10;
    }
     out=out/1000;
     printf("%f",out);
    return 0;
}