有点麻烦

#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,c,d;
cin>>a;
b=a%10;
c=a/10%10;
d=a/100;
if(b0&&c!=0){
cout<<"0"<<c*10+d;
return 0;
}
else if(b0&&c==0){
cout<<"0"<<"0"<<d;
}
else{
cout<<b100+c10+d;
}
return 0;
}