Basic Custom String Class for C++
- by wdow88
Hey all, I'm working on building my own string class with very basic functionality. I am having difficulty understand what is going on with the basic class that I have define, and believe there is some sort of error dealing with the scope occurring. When I try to view the objects I created, all the fields are described as (obviously bad pointer). Also, if I make the data fields public or build an accessor method, the program crashes. For some reason the pointer for the object is 0xccccccccc which points to no where.
How can a I fix this? Any help/comments are much appreciated.
//This is a custom string class, so far the only functions are
//constructing and appending
#include<iostream>
using namespace std;
class MyString1
{
public:
MyString1()
{
//no arg constructor
char *string;
string = new char[0];
string[0] ='\0';
std::cout << string;
size = 1;
}
//constructor receives pointer to character array
MyString1(char* chars)
{
int index = 0;
//Determine the length of the array
while (chars[index] != NULL)
index++;
//Allocate dynamic memory on the heap
char *string;
string = new char[index+1];
//Copy the contents of the array pointed by chars into string, the char array of the object
for (int ii = 0; ii < index; ii++)
string[ii] = chars[ii];
string[index+1] = '\0';
size = index+1;
}
MyString1 append(MyString1 s)
{
//determine new size of the appended array and allocate memory
int newsize = s.size + size;
MyString1 MyString2;
char *newstring;
newstring = new char[newsize+1];
int index = 0;
//load the first string into the array
while (string[index] != NULL)
{
newstring[index] = string[index];
index++;
}
//load the second string
while (s.string[index] != NULL)
{
newstring[index] = s.string[index];
index++;
}
//null terminate
newstring[newsize+1] = '\0';
delete string;
//generate the object for return
MyString2.string=newstring;
MyString2.size=newsize;
return MyString2;
}
private:
char *string;
int size;
};
int main()
{
MyString1 string1;
MyString1 string2("Hello There");
MyString1 string3("Buddy");
string2.append(string3);
return 0;
}
