1.c

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

typedef struct node
{
	char info;
	int priHour;
	int priSec;
	int priMin;
	struct node *next;
}NODE;

typedef struct queue
{
	NODE *head;
}QUEUE;

void initList(QUEUE *pq);
void AddEvent(QUEUE *pq,char event, int min,int sec,int hour);
void DeleteEvent(QUEUE *pq,char *event, int *min,int *sec,int *hour);


void initList(QUEUE *pq)
{
	pq->head=NULL;
}

void AddEvent(QUEUE *pq, char event, int min,int sec,int hour)
{
    NODE *newNode=malloc(sizeof(NODE));
	strcpy(newNode->info,event);
	newNode->priHour=hour;
	newNode->priMin=min;
	newNode->priSec=sec;
	newNode->next=NULL;
	
	NODE *p=pq->head;
	NODE *q=NULL;
	
	while(p!=NULL &&  p->priHour < newNode->priHour &&  p->priMin < newNode->priMin &&  p->priSec < newNode->priSec)
	{
		q=p;
		p=p->next;
	}
	if(q==NULL)
	{
		newNode->next=pq->head;
		pq->head=newNode;
	}
	else
	{
		newNode->next=p;
		q->next=newNode;
	}
}

void DeleteEvent(QUEUE *pq, char *event, int *min,int *sec,int *hour )
{
    NODE *p=pq->head;
	*event=p->info;
	*hour=p->priHour;
	*min=p->priMin;
	*sec=p->priSec;
	pq->head=pq->head->next;
	
	free(p);
}

void ListEvents(QUEUE *pq) {
    NODE *current = pq->head;

    if (current == NULL) {
        printf("Event list is empty.\n");
        return;
    }

    printf("List of Events:\n");
    while (current != NULL) {
        printf("Event: %c\n", current->info);
        printf("Time: %02d:%02d:%02d\n", current->priHour, current->priMin, current->priSec);
        current = current->next;
    }
}

void EditEvent(QUEUE *pq, char oldEvent, char newEvent, int newMin, int newSec, int newHour) {
    NODE *current = pq->head;

    while (current != NULL) {
        if (current->info == oldEvent) {
            current->info = newEvent;
            current->priHour = newHour;
            current->priMin = newMin;
            current->priSec = newSec;
            break;
        }
        current = current->next;
    }
}

//Client code subjected to changes
int main() {
    QUEUE eventQueue;
    initList(&eventQueue);

    
    AddEvent(&eventQueue, 'A', 10, 15, 9);
    AddEvent(&eventQueue, 'B', 30, 45, 11);
    AddEvent(&eventQueue, 'C', 20, 0, 10);

    
    ListEvents(&eventQueue);

    
    EditEvent(&eventQueue, 'B', 'X', 35, 50, 11);

    
    ListEvents(&eventQueue);

    

    return 0;
}