为啥通过不了呢?

#include<stdio.h>
int main(){
	double num1;
	scanf("%lf",&num1);
	int bai = (int)num1/100;
	int shi = ((int)num1/10)%10;
	int ge = (int)num1%10;
	double xs = num1-(bai*100+shi*10+ge);
	double num2 = xs*1000+ge*10+shi*1+bai*0.1; 
	printf("%.1f",num2);
	return 0;
}