Can you check what is wrong with this code
Header file
Code:
#ifndef STRING_HPP
#define STRING_HPP
#include <iostream>
using namespace std;
/* mystring class */
class mystring
{
public:
typedef struct STRING* String;
/*String struct */
struct STRING
{
int size;
char *theString;
};
void validateString( mystring& theString );
mystring()
{
String->theString = NULL;
String->size =0;
}
mystring( const char *init)
{
newString( init );
}
~mystring(mystring& theString)
{
destroyString( theString );
}
mystring& destroyString( mystring& theString );
mystring& newString( char* theString );
char* charAt( mystring& theString, int index );
void printString( mystring& theString);
friend mystring& operator+( mystring& string1, mystring& string2 );
};
#endif
Function file
Code:
#include <iostream.h>
#include <assert.h>
#include "mystring.hpp"
using namespace std;
int stringCount = 0; /*Keep track of string count */
/*------------------------------------------------------
newString
PURPOSE: Create a new string struct
INPUT PARAMETERS:input string
OUTPUT PARAMETERS: string object
------------------------------------------------------ */
mystring& mystring::newString( const char* init )
{
String *newString = NULL;
assert( init != NULL );
newString = new String[init];
assert( newString != NULL );
if ( newString != NULL )
{
newString->theString = new char( strlen(init) + 1 ); /*Assign array size of the new string object*/
assert( newString -> theString != NULL );
if ( newString -> theString != NULL )
{
strcpy( newString -> theString, init );/*Copy input string to string component of the struct */
newString -> size = strlen( newString -> theString );/*Assign size of the String object */
assert( newString -> size == strlen( init ) );
stringCount++;
}
else
{
delete newString ;
newString = NULL;
}
}
return( newString );
}
/*------------------------------------------------------
validateString
PURPOSE: To check if there is any content in the object or empty object */
INPUT PARAMETERS:string object
OUTPUT PARAMETERS: void
------------------------------------------------------ */
void mystring::validateString( mystring& theString )
{
assert( theString != NULL );
assert( theString -> theString != NULL );
assert( theString -> theString[theString -> size] == '\0' );
}
/*------------------------------------------------------
destroyString
PURPOSE: Destroys the string struct
INPUT PARAMETERS:string object
OUTPUT PARAMETERS: string object
------------------------------------------------------ */
mystring& mystring::destroyString( mystring& theString )
{
validateString( theString );
assert( stringCount > 0 );
delete theString -> theString ; /*Delete String component of the struct */
delete theString ; /*Delete the object itself */
theString = NULL;
stringCount--;
return( theString );
}
char* mystring::charAt( mystring& theString, int index )
{
validateString( theString );
assert( index >= 0 );
assert( index < theString -> size );
return( theString -> theString[index] );
}
/*------------------------------------------------------
operator+
PURPOSE: Operator overloading of the operator +
INPUT PARAMETERS:string object
OUTPUT PARAMETERS: new string object which has contents of string1 and 2
------------------------------------------------------ */
mystring& mystring::operator+( mystring& string1, mystring& string2 )
{
String *newString = NULL;
validateString( string2 );
newString = new String[];
assert( newString != NULL );
if ( newString != NULL )
{
newString -> size = this. size + string2 -> size;
newString -> theString = new char [newString -> size + 1];
assert( newString -> theString != NULL );
if ( newString -> theString != NULL )
{
strcpy( newString -> theString, string1 -> theString );
strcpy( &(newString -> theString[string1 -> size]), string2 -> theString );
assert( newString -> size == strlen( newString -> theString ) );
assert( newString -> theString[0] == this. theString[0] );
assert( newString -> theString[this. size] == string2 -> theString[0] );
stringCount++;
}
else
{
delete newString ;
newString = NULL;
}
}
return( newString );
}
/*------------------------------------------------------
printString
PURPOSE: Print the contents of the string object
INPUT PARAMETERS: string onject
OUTPUT PARAMETERS: void
------------------------------------------------------ */
void mystring::printString( mystring& theString )
{
validateString( theString );
cout << theString->size<<endl;
cout << theString -> theString << endl ;
}
