@[homoteam_ikun](/user/896912) 是`b=i;`，不是`b==i`。`b==i`是判断`b`是否等于`i`
by hexuchen @ 2023-10-01 22:46:27
@[homoteam_ikun](/user/896912)
```cpp
#include<iostream>
using namespace std;
int n,m;
int ans,x;
int b;
int main(){
cin>>n>>m;
for(int i=n;i<=m;i++){
b=i; //是b==i
while(b!=0){
if(b%10==2){
ans++;
}
b/=10;
}
}
cout<<ans<<" ";
return 0;
}
```
求关注~
by hexuchen @ 2023-10-01 22:47:21
@[hexuchen](/user/945742) 感谢，已关
by homoteam_ikun @ 2023-10-01 22:49:58