```cpp
#include<stdio.h>
int main(){
int n;
scanf("%d",&n);
int j,b,x=0;
do{
j=n%10;
n=n/10;
b=j;
x=x*10+b*10;
}while(n!=0);
printf("%d",x/10);
return 0;
}
自己已解决
```
by 一柯yike @ 2017-09-16 11:07:45
```cpp
#include<bits/stdc++.h>
using namespace std;
char s[100];
int main()
{
char c;
int tot=0,i=0,j=0,k;
k=10;
c=getchar();
if (c=='0') cout<<c;
if (c=='-') cout<<c;
else {
s[1]=c;
i++;
}
while (c!=10)
{
c=getchar();
i++;
s[i]=c;
}
i--;
for (j=i;j>=1;j--)
{
tot+=s[j]-48;
//cout<<s[j]<<" "<<tot<<endl;
if (tot!=0) cout<<s[j];
}
cout<<endl;
return 0;
}
```
by Hanabi_BNUAZ @ 2017-09-16 11:21:46
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by 江湖高圣哲 @ 2017-09-20 19:55:59
提示：无奈之下用字符串
by Tarensev @ 2017-09-20 21:18:18