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  1. #include<stdio.h>
  2. #include<math.h>
  3. #include<string.h>
  4. #include<string>
  5. #include<iostream>
  6.  
  7. using namespace std;
  8.  
  9. long int convert_base10(const string &num, int base)
  10. {
  11.     int len, dig;
  12.     long int result = 0;
  13.     len = num.size();
  14. //    printf("len = %d\n", len);
  15.     // converting to base 10
  16.     for(int i=0; i<len; i++)
  17.     {
  18.         if((num[len-i-1] >= 'A') && (num[len-i-1] <= 'F'))
  19.             dig = num[len-i-1] - 55;
  20.         else
  21.             dig = num[len-i-1] - 48;
  22.         result +=  (dig * pow(base, i));
  23. //        printf("num[%d] = %d\n", len-i-1, dig);
  24.     }
  25.     return result;
  26. }
  27.  
  28. void convert_basei(long int num, int base, std::string& result)
  29. {
  30.     char rem;
  31.     result = "";
  32.     while (num)
  33.     {
  34.         if ((num % base) >= 10)
  35.         {
  36.             rem = (num % base) + 55;
  37.         }
  38.         else
  39.         {
  40.             rem = (num % base) + 48;
  41.         }
  42.         result.insert(0, 1, rem);
  43.         num /= base;
  44.     }
  45. }
  46. int main()
  47. {
  48.     string num;
  49.     string result;
  50.     int base1, base2, no_spaces;
  51.     while(cin>>num>>base1>>base2)
  52.     {
  53.         long int temp = convert_base10(num, base1);
  54.         convert_basei(temp, base2, result);
  55.         if(result.size() > 7)
  56.             cout<<"  ERROR"<<endl;
  57.         else
  58.         {
  59.             no_spaces = 7 - result.size();
  60.             for(int i=0; i<no_spaces; i++)
  61.                 cout<<" ";
  62.             cout<<result<<endl;
  63.         }
  64.  
  65.     }
  66.     return 0;
  67. }
  68.  
Success #stdin #stdout 0s 3036KB
comments (?)
stdin
copy 
1111000  2 10
1111000  2 16
     2102101        3      10
2102101  3 15
  12312  4  2
     1A 15  2
1234567 10 16
   ABCD 16 15
stdout
copy 
    120
     78
   1765
    7CA
  ERROR
  11001
 12D687
   D071
https://ideone.com/3wJa0i
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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