1 #include <iostream>
 2 #include <cmath>
 3 #define IN 
 4 using namespace std;
 5 int ReadDigitsOfNumber(IN const int number,IN const int decimalSytem);
 6 int DisplayNumberByDigits(IN const int number,IN const int digits,IN const int deciamlSystem);
 7 int main()
 8 {
 9     int number;
 
10     int digits;
11     int decimalSystem = 10;
12 
13     cout<<"請輸入一個十進位制的數字：";
14     cin>>number;
15     digits = ReadDigitsOfNumber(number,decimalSystem);
16     cout<<number<<"是一個"<<digits<<"位數字！"<<endl;
17     DisplayNumberByDigits(number,digits,decimalSystem);
 
18     system("pause");
19     return 0;    
20 }
21 int ReadDigitsOfNumber(IN const int number,IN const int decimalSystem)
22 {
23     int conditionFlag;
24     int digitsCount = 0;
25     int computeDigitsWorkingNumber = number;
26     
27     do
28     {
29         computeDigitsWorkingNumber = computeDigitsWorkingNumber/decimalSystem;
 
30         conditionFlag = computeDigitsWorkingNumber;
31         digitsCount = digitsCount + 1;
32     }while(conditionFlag != 0);
33     return digitsCount;
34 }
35 int DisplayNumberByDigits(IN const int number,IN const int digits,IN const int decimalSystem)
36 {
37     cout<<"該數字從左至右位置上的數字依次為：";
38     int displayWorkingNumber = number;
39     int displayWorkingDigits = digits;    
40     for(int displayWorkingCount = 0;displayWorkingCount<digits;displayWorkingCount++)
41     {
42         cout<<displayWorkingNumber/(int)pow((float)decimalSystem,displayWorkingDigits - 1);
43         cout<<" ";
44         displayWorkingNumber = displayWorkingNumber%(int)pow((float)decimalSystem,displayWorkingDigits - 1);
45         displayWorkingDigits = displayWorkingDigits - 1;
46     }
47     cout<<endl;
48     return 0;
49 }

 執行結果