@[511_Juruo_wyk](/user/1025958) 试试计算
```cpp
len(0)
```
会出问题（-int极限）
所以长度有时是负的
by Dreamer_002 @ 2023-12-22 16:52:09
改成
```cpp
int len(int n)
int size=0;
if(n==0)return 1;
if(n<0){
n=-n;
size++;
}
while(n>0){
n/=10;
size++;
}
return size;
}
```
即可
by Dreamer_002 @ 2023-12-22 16:53:41
抱歉，缺大括号
```cpp
#include<bits/stdc++.h>
using namespace std;
const int N = 11;
char last;
char c[N];
int a1,a2;
int len(int n){
int size=0;
if(n==0)return 1;
if(n<0){
n=-n;
size++;
}
while(n>0){
n/=10;
size++;
}
return size;
}
void print(int a1,int a2,int s,char c){
printf("%d%c%d=%d\n%d\n",a1,c,a2,s,len(a1)+len(a2)+len(s)+2);
return;
}
int main(){
int t;cin>>t;
while(t--){
scanf("%s",c);
if(c[0]>='0'&&c[0]<='9')a1=atoi(c),c[0]=last;
else scanf("%d",&a1);
switch(c[0]){
case 'a':scanf("%d",&a2),print(a1,a2,a1+a2,'+');break;
case 'b':scanf("%d",&a2),print(a1,a2,a1-a2,'-');break;
case 'c':scanf("%d",&a2),print(a1,a2,a1*a2,'*');break;
}
last=c[0];
}
return 0;
}
```
by Dreamer_002 @ 2023-12-22 16:56:10
过了
by Dreamer_002 @ 2023-12-22 16:56:26
@[511_Juruo_wyk](/user/1025958)
by Dreamer_002 @ 2023-12-22 16:57:01
@[zhongruqian](/user/639449) 谢谢，这题我之前换了一种方法过了，不过这种方法一直是令我苦恼的问题。感谢您帮我解决！
by 511_Juruo_wyk @ 2023-12-22 18:43:41