求助大佬

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main()
{
	int n,m,b,g,s;
	cin>>n;
	if(n==0)
	 cout<<0;
	if(n<0)
	{
	 b=ceil(1.0*n/100);
	 s=ceil(1.0*(n-b*100)/10);
	 g=n-b*100-s*10;
	 cout<<"-"<<abs(g)*100+abs(s)*10+abs(b);
	}
	if(n>0)  
	{
	 b=floor(n/100);
	 s=floor((n-b*100)/10);
	 g=n-b*100-s*10;
	 cout<<g*100+s*10+b;
	}
	return 0;
}