was ist daran nur falsch?

class convert
{
	private:
        char* string;

        long table_length;
        char** extra;       /* [zeichen][nummer im original] */
        char** letters;
        char** numbers;

	public:	
        convert(char* string);
        ~convert();

        void convert_str(char* string);
        char* get_conv_str();
};

inline convert::convert(char* str) : string(str) 
{
	while( *str++ != '\0' ) table_length++; //achtung '\0' nicht vergessen

	extra = new char*[table_length];
	for( int i = 0 ; table_length >= i; i++ ) extra = new char[2];

	letters = new char*[table_length];
	for( int i = 0 ; table_length >= i; i++ ) letters = new char[2];

	numbers = new char*[table_length];
	for( int i = 0 ; table_length >= i; i++ ) numbers = new char[2];
}

error C2440: '=' : cannot convert from 'char *' to 'char **'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Maxi

extra = new char[2] geht so nicht
obendrüber hast du doch schon extra = new char*[tablelength]
wieso willst du den zeiger dann erstezen?
ich denk ma es muss heißen extra[i] = new char[2]