»pls help or i am doomed

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

struct node
{
int data;
struct node *next;
}*head;



void append(int num)
{
struct node *temp,*right;
temp= (struct node *)malloc(sizeof(struct node));
temp->data=num;
right=(struct node *)head;
while(right->next != NULL)
right=right->next;
right->next =temp;
right=temp;
right->next=NULL;
}



void add( int num )
{
struct node *temp;
temp=(struct node *)malloc(sizeof(struct node));
temp->data=num;
if (head== NULL)
{
head=temp;
head->next=NULL;
}
else
{
temp->next=head;
head=temp;
}
}

void insert(int num)
{
int c=0;
struct node *temp;
temp=head;
if(temp==NULL)
{
add(num);
}
else
{
while(temp!=NULL)
{
if(temp->data<num)
c++;
temp=temp->next;
}
if(c==0)
add(num);
else if(c<count())
addafter(num,++c);
else
append(num);
}
}



int delete(int num)
{
struct node *temp, *prev;
temp=head;
while(temp!=NULL)
{
if(temp->data==num)
{
if(temp==head)
{
head=temp->next;
free(temp);
return 1;
}
else
{
prev->next=temp->next;
free(temp);
return 1;
}
}
else
{
prev=temp;
prev= temp->next;
}
}
return 0;
}


void display(struct node *r)
{
r=head;
if(r==NULL)
{
return;
}
while(r!=NULL)
{
printf("%d ",r->data);
r=r->next;
}
printf("\n");
}


int count()
{
struct node *n;
int c=0;
n=head;
while(n!=NULL)
{
n=n->next;
c++;
}
return c;
}


int main()
{
int i,num;
struct node *n;
head=NULL;
while(1)
{
printf("\nList Operations\n");
printf("===============\n");
printf("1.Insert\n");
printf("2.Display\n");
printf("3.Size\n");
printf("4.Delete\n");
printf("5.Exit\n");
printf("Enter your choice : ");
if(scanf("%d",&i)<=0){
printf("Enter only an Integer\n");
exit(0);
} else {
switch(i)
{
case 1: printf("Enter the number to insert : ");
scanf("%d",&num);
insert(num);
break;
case 2: if(head==NULL)
{
printf("List is Empty\n");
}
else
{
printf("Element(s) in the list are : ");
}
display(n);
break;
case 3: printf("Size of the list is %d\n",count());
break;
case 4: if(head==NULL)
printf("List is Empty\n");
else{
printf("Enter the number to delete : ");
scanf("%d",&num);
if(delete(num))
printf("%d deleted successfully\n",num);
else
printf("%d not found in the list\n",num);
}
break;
case 5: return 0;
default: printf("Invalid option\n");
}
}
}
return 0;
}
@Arjenpro help not able to delete an input from the link list

 

emfg tf??

 

I can't find the error in the syntax

 

I thought @Arjenpro is a developer he can help me I have to correct this

 

Basic c++ lul and arjen probs dont know cuz he dun c++

 

Dude u could just message arjen about this.What was the need of pasting a huge chunk of bs on a forum post -_-