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I'm not sure how to use a destructor to delete dynamically allocated array.
I'm not sure how to use a destructor to delete dynamically allocated array. My professor said we have to delete each individual element of the array before deleting the whole array otherwise it would cause a memory leak. But I'm not sure how I would go about doing that with my program.
#include <iostream>
#include <cstring>
using namespace std;
class String
{
private:
char* data;
static int numA;
public:
String();
String(const string&);
String(const String&);
~String();
static int a_count()
{
return numA;
}
void countA();
void lowerNumA();
bool operator < (const String& obj);
bool operator > (const String& obj);
bool operator == (const String& obj);
void operator = (const String& obj);
void operator += (const String& obj);
char* operator + (const String& obj);
int operator ! ();
char operator[] (int inIndex);
char* operator * ()
{
return data;
}
friend ostream & operator << (ostream&, String&);
};
String::String()
{
data = new char[0];
data[0] = '';
countA();
}
String::String(const string& thing)
{
data = new char[0];
strcpy(data, thing.c_str());
countA();
}
String::String(const String &s2)
{
data = s2.data;
countA();
}
String::~String()
{
delete [] data;
}
bool String::operator < (String const &obj)
{
if(strcmp(data, obj.data) < 0)
{
return true;
}
else
{
return false;
}
}
void String::countA()
{
for(int i = 0; data[i] != ''; i++)
{
if(data[i] == 'a' || data[i] == 'A')
{
numA++;
}
}
}
void String::lowerNumA()
{
for(int i = 0; data[i] != ''; i++)
{
if(data[i]=='a' || data[i]=='A')
{
numA--;
}
}
}
bool String::operator > (String const &obj)
{
if(strcmp(data, obj.data) > 0)
{
return true;
}
else
{
return false;
}
}
bool String::operator == (String const &obj)
{
if(strcmp(data, obj.data) == 0)
{
return true;
}
else
{
return false;
}
}
void String::operator = (String const &obj)
{
lowerNumA();
data = obj.data;
countA();
}
void String::operator += (String const &obj)
{
lowerNumA();
int element = 0;
while(data[element] != '')
{
element++;
}
int element2 = 0;
while(obj.data[element2] != '')
{
data[element] = obj.data[element2];
element++;
element2++;
}
data[element]='';
countA();
}
char* String::operator + (String const &obj)
{
char* newChar = new char[100];
int newCount = 0;
int index = 0;
while(data[index]!='')
{
newChar[newCount]= data[index];
newCount++;
index++;
}
index = 0;
while(obj.data[index]!='')
{
newChar[newCount]= obj.data[index];
newCount++;
index++;
}
newChar[newCount] = '';
cout << "";
return newChar;
}
int String::operator ! ()
{
int index = 0;
int size = 0;
while(data[index] != '')
{
size++;
index++;
}
return size;
}
char String::operator[] (int inIndex)
{
int index=0;
while(data[index] != '')
{
index++;
}
if(inIndex >= 0 && inIndex <= index)
{
return data[inIndex];
}
else
{
cout<<"out of boundn";
return ' ';
}
}
int String::numA;
int main()
{
// Constructors
String A("apple");
String B("banana");
String C("cantaloupe");
String D(B);
String E;
// static member function
cout << "Number of a's = " << String::a_count() << endl << endl;
// Overloaded insertion operator
cout << "A = " << A << endl;
cout << "B = " << B << endl;
cout << "C = " << C << endl;
cout << "D = " << D << endl;
cout << "E = " << E << endl << endl;
// Relational operators
cout << boolalpha;
cout << "A < B " << (A < B) << endl;
cout << "B < A " << (B < A) << endl;
cout << "A == B " << (A == B) << endl << endl;
// Assignment operator
A = B;
cout << "A = " << A << endl;
cout << "A == B " << (A == B) << endl << endl;
// Size (bang) operator
cout << "A size = " << !A << endl;
cout << "E size = " << !E << endl << endl;
// Unary * operator
cout << "C text = " << *C << endl << endl;
// Plus operator
cout << "A + B = " << A + B << endl << endl;
// Plus equal operator
A += C;
cout << "A = " << A << endl << endl;
// Index operator
cout << "A[3] = " << A[3] << endl << endl;
// static member function
cout << "Number of a's = " << String::a_count() << endl;
}
ostream & operator << (ostream& out, String& things)
{
int index = 0;
while(things.data[index] != '')
{
out << things.data[index];
index++;
}
return out;
}
