sicily 1240 Faulty Odometer

 1 //sicily 1240 Faulty Odometer
 2 #include <iostream>
 3 #include <cstdio>
 4 #include <cmath>
 5 #include <cstring>
 6 
 7 using namespace std;
 8 
 9 char num[15];
10 int a[15];
11 
12 int main()
13 {
14     
15     while(cin >> num ,strcmp(num,"0"))
16     {
17         memset(a,0,sizeof(a));
18         long long ans=0;
19         int len=strlen(num);
20         for(int i=0; i<len; i++)
21         {
22             if((num[i]-‘0‘>3))
23                 a[i]=num[i]-‘0‘-1;            
24             else
25                 a[i]=num[i]-‘0‘;
26         }
27         int fac=1;
28         for(int i=0; i<len; i++)
29             ans+=a[len-i-1]*(int)pow(9,i);
30         cout << num << ": ";
31         cout << ans << endl;
32     }
33     return 0;
34 }