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dbzprogrammer

My Own Input Function Problem

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Ok, so I am creating a program that needs to be saving keyboard input to a character pointer, however the CIN function wont support that, so I coded something myself. But when you type in a character the program crashes.
#include <conio.h>
#include <iostream>
using namespace std;

typedef struct charlink
{
	char data;
	charlink* next;
}charlinkthing;

char* translate(charlinkthing* const);

int main()
{
	char ch;
	char *string=NULL;
	bool done;
	charlinkthing* start=NULL;
	charlinkthing* current=NULL;
	charlinkthing* nextcur=NULL;

	cout << "Welcome to my cin program" << endl;
	do
	{
		ch=getch();
		if(ch==13)
		{
			cout << endl;
			string=translate(start);
		}
		else
		{
			cout << ch;
			if(!start->data)
			{
				current = new charlink;
				current->data = ch;
				start = current;
				start->next = new charlink;
				current = start->next;
			}
			else
			{
				current->data = ch;
				nextcur = new charlink;
				current->next = nextcur;
				current = nextcur;
				nextcur = NULL;
			}
		}
	}while(!done);
	return 1;
}

char* translate(charlinkthing* const startchar)
{
	char *ch;
	return ch;
}

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This is the wierdest thing ever... I simply changed (!start->data) to (!start)...


#include <conio.h>
#include <iostream>
using namespace std;

typedef struct charlink
{
char data;
charlink* next;
}charlinkthing;

char* translate(charlinkthing* const);

int main()
{
char ch;
char *string=NULL;
bool done;
charlinkthing* start=NULL;
charlinkthing* current=NULL;
charlinkthing* nextcur=NULL;

cout << "Welcome to my cin program" << endl;
do
{
ch=getch();
if(ch==13)
{
cout << endl;
string=translate(start);
}
else
{
cout << ch;
if(!start)
{
current = new charlink;
current->data = ch;
start = current;
start->next = new charlink;
current = start->next;
}
else
{
current->data = ch;
nextcur = new charlink;
current->next = nextcur;
current = nextcur;
nextcur = NULL;
}
}
}while(!done);
return 1;
}

char* translate(charlinkthing* const startchar)
{
char *ch;
return ch;
}

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New Problem, everytime I hit enter the program crashes.


#include <conio.h>
#include <iostream>
using namespace std;

typedef struct charlink
{
char data;
charlink* next;
}charlinkthing;

char* translate(charlinkthing* const);
char* input();

int main()
{
char* output;
cout << "Welcome to my cin program" << endl;
output = input();
cout << endl;
cout << output << endl;
return 1;
}

char* input()
{
char ch;
char *string=NULL;
bool done=false;
bool notrue=false;
charlinkthing* start=NULL;
charlinkthing* current=NULL;
charlinkthing* nextcur=NULL;

do
{
ch=getch();
if(ch==13)
{
cout << endl;
current->next = NULL;
string=translate(start);
current=start->next;
delete start;
start=NULL;
do
{
if(current->next=NULL)
notrue=true;
else
{
nextcur=current->next;
delete current;
current = NULL;
}
}while(notrue);
done=true;
}
else
{
cout << ch;
if(!start)
{
current = new charlink;
current->data = ch;
start = current;
start->next = new charlink;
current = start->next;
}
else
{
current->data = ch;
nextcur = new charlink;
current->next = nextcur;
current = nextcur;
nextcur = NULL;
}
}
}while(!done);
return string;
}

char* translate(charlinkthing* const startchar)
{
char *ch;
charlinkthing *current;
bool finished=false;
current=startchar;
do
{
if(current->next=NULL)
{
*ch='\0';
finished=true;
}
else
{
*ch++=current->data;
current=current->next;
}
}while(finished);
return ch;
}

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