Add Function for Long Integer Linked List

Long interger linked list add function

Posting I am working on program assignment in structures (c language)after entering the required intergers the add function will not compile.I receive error messages I am using a Microsoft c, c++ 6.0 compiler. The help required is to provide a working add function in c. Hopefully after that I will be be able to write similar functions to subtract multiply and divide.

The given problem requires that an add function be provided that should add two given lists n and m.

The source code of the problem is attached

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct node
{
int data; // char field data
struct node* next; //pointer field next
}NODE,*NODEP,**NODEPP; //defines three common types

// Function prototypes

void addhead(NODEPP listp,int value);

void getinput1( NODEPP );

void getinput2( NODEPP );
void showtext ( char* );
void showlist( char*,NODEP);
void add_list( listp );
void add();
void subtract();
void multiply();
void divide();
void main (void)
{

char cmd;

showtext(" Enter a to add, s to subtract, m to multiply , d to divide,q when finished");
for (;;)
{
scanf("%c",&cmd);

switch(cmd)
{
case 'a': add(); //addition

break;
case 's': subtract(); // subtract
break;
case 'm':multiply(); //multiply
break;
case 'd':divide(); //divide
break;
case 'q':
exit(0);
break;
}
showtext("nEND OF RUNn");
}

}// end of main

// Adds new node at the heaad of the list. puts value in the data field

void addhead(NODEPP listp, int value)
{

NODEP p = (NODEP)malloc( sizeof (NODE));
p->data = value; // Data Field gets value
p->next = *listp; // links p node to old head
*listp = p; // makes p a new head node
}

void getinput1( NODEPP listp ) //creats a linked list containing numbers
{ // entered by the user.(uses add_to_list)

int n;

printf("Enter a series of integers (! when finished ):");

while((scanf("%d",&n))==1)

addhead(listp,n); //Add new node to list

}

void getinput2( NODEPP listp) //creats a linked list containing numbers
{ // entered by the user.(uses add_to_list)

int m;

printf("Enter a second series of integers (! when finished ):");

while((scanf("%d",&m))==1)

addhead(listp,m); //Add new node to list

}

void showtext ( char* string ) //Displays text
{

printf(string);

}

void showlist(char* string, NODEP list) // Prints list to screen
{

int i =1;
showtext(string);
while (list !=NULL)
{
printf( "%5d",list->data);
if(i++% 10 ==0)showtext("n");
list =list->next;
}
showtext("n END OF LISTn");

}

void add(NODEPP listp ) //add function
{
NODEP n= NULL;
NODEP m =NULL;
NODEP t= NULL;

int tPtr;
tPtr=&t;
showtext( "**INITIAL LIST DATA**n");

getinput1( &n);
showlist("List 1n",n);
getchar();

getinput2( &m);
showlist("List 2n",m);

getchar();

while(t!=0)
{
t->data= n->data+m->data;
}

showlist( "The sum of List 1 and List 2 is:n",t);
}
void subtract(NODEPP listp)

{

}

void multiply()
{

}

void divide()
{

}