Ozzy Ozzy - 25 days ago 6
C Question

undefined reference to 'clrscr' and ld returned 1 exit status

Im trying to compile the c code free available. The code is relative to implement a Linked List.

But when I try to build and run the code I get this error twice:

undefined reference to 'clrscr'


and this error one time:

error: ld returned 1 exit status


Im a beginner in c and Im with some difficutlties trying to fix this, do you see what can be wrong?

code:

#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
void create();
void insert_atfirst();
void insert_atlast();
void insert();
void delete_bypos();
void delete_byval();
void display();
int menu();
struct node
{
int data;
struct node *next;
}*first=NULL,*last=NULL,*temp=NULL;
void main()
{
int ch;
clrscr();
do{
ch=menu();

switch(ch)
{
case 1:create();
break;
case 2:insert_atfirst();
break;
case 3:insert_atlast();
break;
case 4:insert();
break;
case 5:delete_bypos();
break;
case 6:delete_byval();
break;
case 7:display();
break;
case 8:exit(0);
case 9:clrscr();
default:printf("\nError-->Enter a valid choice!!");
exit(0);
}
}while(1);
}

void create()
{
temp=(struct node*)malloc(sizeof(struct node));
printf("\nEnter the Data in the Node:");
scanf("%d",&temp->data);
temp->next=NULL;
if(first==NULL)
{
first=temp;
last=temp;
}
else
{
last->next=temp;
last=temp;
}
}

void insert_atfirst()
{
temp=(struct node*)malloc(sizeof(struct node));
printf("\nEnter Element:");
scanf("%d",&temp->data);
temp->next=first;
first=temp;
}
void insert()
{
struct node *t, *t1;
int pos, count=1,AB;
printf("\nEnter Position to be inserted:");
scanf("%d",&pos);
printf("\nAfter[1] or Before[2]:");
scanf("%d",&AB);
temp=(struct node*)malloc(sizeof(struct node));
printf("\nEnter data:");
scanf("%d",&temp->data);
temp->next=NULL;
t=t1=first;
while(t!=NULL)
{
if(pos==count)
break;
else
{
t=t1;
t=t->next;
count++;
}
}
if(AB==1)
{
temp->next=t->next;
t->next=temp;
}
else if(AB==2)
{
temp->next=t;
t1->next=temp;
}
else
printf("\nInvalid Input");
}

void insert_atlast()
{
temp=(struct node*)malloc(sizeof(struct node));
printf("\nEnter value to be inserted at last:");
scanf("%d",&temp->data);
last->next=temp;
last=temp;
}

void delete_bypos()
{
struct node *t,*t1;
int pos, count=1;
printf("\nEnter the Position of the element you would like to delete:");
scanf("%d",&pos);
t=t1=first;
while(t!=NULL)
{
if(pos==count)
t1=t;
t=t->next;
count++;
}
if(pos==1)
{
first=t->next;
printf("\nExceuted-->First Node is deleted!!");
}
else if(t==last)
{
t1->next=NULL;
free(t);
printf("\nExecuted-->Last Node is deleted!!");
}
else
{
t1->next=t->next;
free(t);
printf("\nExecuted-->Node has been deleted!!");
}
}

void delete_byval()
{
int val, count=1;
struct node *t,*t1;
printf("\nEnter value:");
scanf("%d",&val);
t=t1=first;
while(t!=NULL)
{
if(val==t->data)
break;
else
{
t=t->next;
count++;
}
}
if(t==first)
{
first=t->next;
free(t);
}
else if(first==last)
{
t1->next=NULL;
free(t);
last=t1;
}
else
{
t1->next=t->next;
free(t);
}
}
void display()
{
temp=first;
while(temp!=NULL)
{
printf("|%d|%d| --> ",temp->data,temp->next);
temp=temp->next;
}
}

int menu()
{
int ch;
printf("\n------------");
printf("\nSingle Linked List");
printf("\n------------");
printf("\n1.Create\n2.Insert at first\n3.Insert at last\n4.Insert at Middle\n5.Delete by Position\n6.Delete by Value\n7.Display\n8.Exit");
printf("\n\n-->Enter Your Choice:");
scanf("%d",&ch);
return ch;
}

Answer

clrscr() function works only in Borland's C compilers - Turbo C etc. Use system("cls") function instead.