Sorted linked list

Program of sorted linked list
# include <stdio.h>
# include <malloc.h>
struct node
{
int info;
struct node *link;
}*start;
main()
{
int choice,n,m,i;
start=NULL;
while(1)
{
printf("1.Insert\n");
printf("2.Delete\n");
printf("3.Display \n");
printf("4.Exit\n");
printf("Enter your choice : ");
scanf("%d",&choice);
switch(choice)
{
case 1:
printf("Enter the element to be inserted : ");
scanf("%d",&m);
insert(m);
break;
case 2:
printf("Enter the element to be deleted : ");
scanf("%d",&m);
del(m);
break;
case 3:
display();
break;
case 4:
exit();
default:
printf("Wrong choice\n");
}/*End of switch*/
}/*End of while*/
} /*end of main */
insert(int num)
{
struct node *q,*temp;
temp= malloc(sizeof(struct node));
temp->info=num;
/*list empty or item to be added in begining */
if(start == NULL || num < start->info)
{
temp->link=start;
start=temp;
return;
}
else
{
q=start;
while(q->link != NULL && q->link->info < num)
q=q->link;
temp->link=q->link;
q->link=temp;
}
}/*End of insert()*/
del(int num)
{
struct node *temp,*q;
if(start->info==num)
{
temp=start;
start=start->link;
  /*first element deleted*/
free(temp);
return;
}
q=start;
while(q->link->link!=NULL)
{
if(q->link->info==num)     /*element deleted in between*/
{
temp=q->link;
q->link=temp->link;
free(temp);
return;
}
q=q->link;
}/*End of while */
if(q->link->info==num)    /*last element deleted*/
{
temp=q->link;
free(temp);
q->link=NULL;
return;
}
printf("Element %d not found\n",num);
}/*End of del()*/
display()
{
struct node *q;
if(start == NULL)
{
printf("List is empty\n");
return;
}
q=start;
printf("List is :\n");
while(q != NULL) {
printf("%d ", q->info);
q=q->link;
}
printf("\n");
}/*End of display() */