九度[1080]进制转换

 1 # include<iostream>
 2 # include<string>
 3 # include<cstring>
 4 using namespace std;
 5 struct bigint{ //定义一个大整数类
 6     int a[500];
 7     int remain;
 8     int i;
 9     bigint & operator*(int & value){ //重载乘法
10         for(i=0;i<500;i++)
11             a[i]=a[i]*value;
12         int c=0;
13         for(i=0;i<500;i++){
14             a[i]=a[i]+c;
15             c=a[i]/100;
16             a[i]=a[i]%100;
17         }
18         return *this;
19     }
20     bool operator !=(const int & value) //判断整数是否为0
21     {
22         for(i=0;i<500;i++)
23             if(a[i]!=value) break;
24         if(i<500) return true;
25         return false;
26     }
27     bigint & operator/(int &value){//重载除法
28         int c=0;
29         for(i=499;i>=0;i--)
30             if(a[i]!=0) break;
31         //cout<<"i"<<i<<endl;
32         for(;i>=0;i--)
33         {
34             a[i]=(a[i]+c*100);
35             c=a[i]%value;
36             a[i]=a[i]/value;
37         }
38         remain=c;
39         return *this;
40     }
41 };
42 int main(){
43     int m=0,n=0;
44     int i=0;
45     while(cin>>m>>n){
46         string s;
47         cin>>s;
48         if(s=="0") {cout<<0<<endl;continue;}
49         int l=s.size();
50         bigint bida;
51         memset(bida.a,0,sizeof(bida.a));
52         for(i=0;i<l;i++)
53         {
54             int k=m;
55             if(i!=0) bida=bida*k;
56             if(s[i]<=‘9‘) {
57                 int k=s[i]-‘0‘;
58                 bida.a[0]=bida.a[0]+k;
59             }
60             else {
61                 int k=s[i]-‘A‘+10;
62                 bida.a[0]=bida.a[0]+k;
63             }
64         } //转换为十进制数bida;
65         //cout<<bida.a[0];
66         int b[2000];
67         i=0;
68         memset(b,0,sizeof(b));
69         while(bida!=0){
70             bida=bida/n;
71             b[i]=bida.remain;
72             i++;
73         }
74         for(i=i-1;i>=0;i--)
75         {
76             if(b[i]>9) {char c=b[i]-10+‘a‘;cout<<c;}
77             else cout<<b[i];
78         }
79         cout<<endl;
80     }
81     return 0;
82 }

写得有点儿乱，先传上。回头再整理