There's nothing in the output. Only blinking cursor.

Question

#include<stdio.h>
#include<stdlib.h>
struct node
{
int rno;
struct node *next;
};
void main()
{
int n,i,r;
struct node *head;
//head=(struct node *)malloc(sizeof(struct node));
head=NULL;
//scanf("%d",&n);
n=5;
for(i=1;i<=n;++i)
{
r=i;
//scanf("%d",&r);
if(head==NULL)
{
head=(struct node *)malloc(sizeof(struct node));
head->rno=r;
head->next=NULL;
}
struct node *tmp;
tmp=head;
int f=0;
while(tmp!=NULL)
{
if(tmp->rno==r)
{
f=1;
break;
}
tmp=tmp->next;
}
if(f=0)
{
tmp->nex

Answer 1

Before creating a new node you should traverse list to check existing value.
If there is no such value then create a new node, set its next member to head value, and set head to new node address:
https://code.sololearn.com/cwvgqrjmmRyn

Answer 2

https://code.sololearn.com/cuKVKOfYVfvG/?ref=app

Answer 3

The code is attached

Answer 4

Why your main is void
any remove comments
https://code.sololearn.com/cLTyWsNUMZMG/?ref=app