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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(abs((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.         cout << digit << "*";
  40.  
  41.         // integer division to chop of least significant digit
  42.         value = value / 10;
  43.     }
  44.     cout <<endl; 
  45. }
  46.  
  47. LargeInteger::~LargeInteger()
  48. {
  49.     cout << " destructor entered, freeing my digits" << endl
  50.          << " id = " << id << endl
  51.          //<< " value=" << tostring() // uncomment this after you implement tostring()
  52.          << endl;
  53.     delete[] this->digits;
  54. }
  55.  
  56. string LargeInteger::tostring()
  57. {
  58.     string intValue;
  59.     bool negative = false; 
  60.     for (int i=numDigits-1; i>=0; i--) {
  61.         intValue +=  abs(digits[i]) + '0';
  62.         if (digits[i]<0) 
  63.             negative = true;
  64.     }
  65.     if (negative)
  66.         intValue.insert(0,1,'-');
  67.     return intValue;
  68. }
  69.  
  70. int LargeInteger::nextLargeIntegerId = 0; 
  71.  
  72. int main() {
  73.     // test constructors, destructors and tostring()
  74.     cout << "Testing Constructors, tostring() and destructor:" << endl;
  75.     cout << "-------------------------------------------------------------" << endl;
  76.     LargeInteger li1(-3483);
  77.     cout << "li1 = " << li1.tostring() << endl;
  78.  
  79.     return 0;
  80. }
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:
-------------------------------------------------------------
-3*-8*-4*-3*
li1 = -3483
 destructor entered, freeing my digits
 id = 0
https://ideone.com/ivepih
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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