Operation on String - C ++ Program:
Write a program to define operations on string in c++.
class String {
char *char_ptr; // pointer to string contents
int length; // length of string in characters
public:
// three different constructors
String(char *text); // constructor using existing string
String(int size = 80); // creates default empty string
String(String& Other_String); // for assignment from another
// object of this class
~String() {delete char_ptr;};
int Get_len (void);
void Show (void);
};
String::String (char *text)
{
length = strlen(text); // get length of text
char_ptr = new char[length + 1];
strcpy(char_ptr, text);
};
String::String (int size)
{
length = size;
char_ptr = new char[length+1];
*char_ptr = '\0';
};
String::String (String& Other_String)
{
length = Other_String.length; // length of other string
char_ptr = new char [length + 1]; // allocate the memory
strcpy (char_ptr, Other_String.char_ptr); // copy the text
};
int String::Get_len(void)
{
return (length);
};
void String::Show(void)
{
cout << char_ptr << "\n";
};
main () // test the functions
{
String AString ("Allocated from a constant string.");
AString.Show();
String BString; // uses default length
cout << "\n" << BString.Get_len() << "\n" ; //display length
BString = "This is BString";
String CString(BString); // invokes the third constructor
CString.Show(); // note its contents
}