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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <string>
  4. #include <cmath>
  5. #include <cassert>
  6.  
  7. using namespace std;
  8.  
  9. class LargeInteger {
  10. private:
  11.     static int nextLargeIntegerId;
  12.     int id;
  13.     int numDigits; // number of digits in LargeInt / size of alloc array
  14.     int* digits; // the digits of the LargeInt we are representing
  15.  
  16. public:
  17.     LargeInteger(int value);
  18.     ~LargeInteger();
  19.     string tostring();
  20. };
  21.  
  22. LargeInteger::LargeInteger(int value)
  23. {
  24.     // set this instance id
  25.     id = nextLargeIntegerId++;
  26.  
  27.     numDigits = (int)log10((double)value) + 1;
  28.  
  29.     // allocate an array of the right size
  30.     digits = new int[numDigits];
  31.  
  32.     // iterate through the digits in value, putting them into our
  33.     // array of digits.
  34.     int digit;
  35.     for (int digitIndex = 0; digitIndex < numDigits; digitIndex++) {
  36.         // least significant digit
  37.         digit = value % 10;
  38.         digits[digitIndex] = digit;
  39.  
  40.         // integer division to chop of least significant digit
  41.         value = value / 10;
  42.     }
  43. }
  44.  
  45. LargeInteger::~LargeInteger()
  46. {
  47.     cout << " destructor entered, freeing my digits" << endl
  48.          << " id = " << id << endl
  49.          //<< " value=" << tostring() // uncomment this after you implement tostring()
  50.          << endl;
  51.     delete[] this->digits;
  52. }
  53.  
  54. string LargeInteger::tostring()
  55. {
  56.     string intValue;
  57.     for (int i=numDigits-1; i>=0; i--) 
  58.         intValue +=  digits[i] + '0';
  59.     return intValue;
  60. }
  61.  
  62. int LargeInteger::nextLargeIntegerId = 0; 
  63.  
  64. int main() {
  65.     // test constructors, destructors and tostring()
  66.     cout << "Testing Constructors, tostring() and destructor:" << endl;
  67.     cout << "-------------------------------------------------------------" << endl;
  68.     LargeInteger li1(3483);
  69.     cout << "li1 = " << li1.tostring() << endl;
  70.  
  71.     return 0;
  72. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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Testing Constructors, tostring() and destructor:
-------------------------------------------------------------
li1 = 3483
 destructor entered, freeing my digits
 id = 0
https://ideone.com/Z6FpGV
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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