@[KT1001](/user/590836)
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,m;
char flag='-';
cin>>n;
int t = n;
while(t){
int temp = t % 10;
m = m * 10 + temp;
t /= 10;
}
if(n) printf("%d", m);
else cout<<flag<<m;
return 0;
}
```
by xxs12345 @ 2024-04-01 16:06:58
@[KT1001](/user/590836) printf的问题
by xxs12345 @ 2024-04-01 16:07:35
@[xxs12345](/user/1122479) 请问这个printf为什么会导致错误呢？您能解答一下吗？谢谢！
by KT1001 @ 2024-04-01 16:13:34
```c
#include<stdio.h>
int main()
{
int n, m=0;
char flag = '-';
scanf("%d", &n);
int t = n;
while(t){
int temp = t % 10;
m = m * 10 + temp;
t /= 10;
}
if(n>=0) printf("%d", m);
else printf("%c%d",flag,-m);
return 0;
}
```
by keep_shining @ 2024-04-01 16:15:16
m要赋初值0
@[KT1001](/user/590836)
by keep_shining @ 2024-04-01 16:16:31
或者放在main函数外
@[KT1001](/user/590836)
by keep_shining @ 2024-04-01 16:17:22
以后要记住
by keep_shining @ 2024-04-01 16:21:17
@[QAQll955cn](/user/1071381) m赋初值或者把m放在main函数外面可以前面的测试点，但是最后一个Subtask #1却无法通过，这是怎么回事呢？
by KT1001 @ 2024-04-01 16:22:37
请你想一下$n=0$的情况
by keep_shining @ 2024-04-01 16:25:52
你输出$-0$
by keep_shining @ 2024-04-01 16:26:18