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Write a C program for calendar application mini Project ?

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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <time.h>
#define SIZE 200

struct node *create_node(int day,int month,int year,char note[225]);
struct qnode *qcreate_node(int day,int month,int year,float stime,float etime,char sch_name[SIZE]);
void delete(char key[255]);
void enque(int day,int month,int year,float stime,float etime,char sch_name[]);
void deque(int j);
int isLeapYear( int y );
int leapYears( int y );
int todayOf( int y, int m, int d);
long days( int y, int m, int d);
void addNote(int day,int month,int year,char note[255]);
void displayNotes();
int checkSchedule(struct qnode *front,float stime,float etime);
void availableSchedule(struct qnode *front);
void printCalender(int m,int y);
struct qnode* SortedMerge(struct qnode* a, struct qnode* b);
void partition(struct qnode* source,struct qnode** frontRef, struct qnode** backRef);
void MergeSort(struct qnode** headRef);
void printqueue(int j);
void addSchedule(int d,int m,int y);

struct node {
 int day;
 int month;
 int year;
 char note[255];
	struct node *next;
};
struct qnode {//queue using linked list
 float stime,etime;
 int day,month,year;
 char sch_name[SIZE];//schedule_name
 struct qnode *next;
};

struct ll {
	struct node *start;
}s;
struct node *ptr;
struct qq {
 struct qnode *front;
 struct qnode *rear;
}q[SIZE];

int i=-1;

struct node *create_node(int day,int month,int year,char note[225]) {
	struct node *new_node=(struct node *)malloc(sizeof(struct node));
	new_node->day=day;
 new_node->month=month;
 new_node->year=year;
 strcpy(new_node->note,note);
	new_node->next=NULL;
	return(new_node);
}
struct qnode *qcreate_node(int day,int month,int year,float stime,float etime,char sch_name[SIZE]) {
	struct qnode *new_node=(struct qnode *)malloc(sizeof(struct qnode));
 new_node->day=day;
 new_node->month=month;
 new_node->year=year;
	new_node->stime=stime;
 new_node->etime=etime;
 strcpy(new_node->sch_name,sch_name);
	new_node->next=NULL;
	return(new_node);
}

void delete(char key[255]) {
 struct node *ptr,*preptr;
 ptr=s.start; preptr=NULL;
	if (s.start==NULL)
		printf("list is empty");

	else{

		while(ptr!=NULL) {
			if (strcmp(key,ptr->note)==0)	{
				if (ptr->next==NULL&&preptr!=NULL) {
					preptr->next=NULL;
 free(ptr);
				}
				else if (ptr==s.start&&ptr->next==NULL) {
					s.start=NULL;
 free(ptr);
				}
				else if (ptr==s.start) {
					s.start=ptr->next;
 free(ptr);
				}
			 	else {
					preptr->next=ptr->next;
 free(ptr);
				}
			}
			if(ptr!=NULL) {
 preptr=ptr;
 		 ptr=ptr->next;
 }
		}return;
 }
}

void enque(int day,int month,int year,float stime,float etime,char sch_name[]) {
 struct qnode *new_node=qcreate_node(day,month,year,stime,etime,sch_name);
 if (q[i].rear==NULL) {
 q[i].rear=q[i].front=new_node;
 }
 else {
 q[i].rear->next =new_node;
 q[i].rear=new_node;
 }
}

void deque(int j) {//one condition is remaining
 struct qnode *temp;
 int k;
 if (q[j].rear==NULL) {
 printf("queue is empty");
 }
 else if(q[j].rear==q[j].front) {
 q[j].front=NULL;
 q[j].rear=NULL;
 for(k=j;k<i;k++) {
 q[k].front=q[k+1].front;
 q[k].rear=q[k+1].rear;
 q[k+1].front=NULL;
 q[k+1].rear=NULL;
 }
 i--;
 printf("now your schedule is EMPTY\t ENJOY!!\n\n");
 }
 else {
 temp=q[j].front;
 q[j].front=q[j].front->next;
 free(temp);
 printqueue(j);

 }
}

int isLeapYear( int y ){
 return(y % 400 == 0) || ((y % 4 == 0) && (y % 100 != 0));
}

int leapYears( int y ){
 return y/4 - y/100 + y/400;
}

int todayOf( int y, int m, int d) {
 static int DayOfMonth[] =
 { -1,0,31,59,90,120,151,181,212,243,273,304,334};
 return DayOfMonth[m] + d + ((m>2 && isLeapYear(y))? 1 : 0);
}
long days( int y, int m, int d){
 int lastYear;
 lastYear = y - 1;
 return 365L * lastYear + leapYears(lastYear) + todayOf(y,m,d);
}

void addNote(int day,int month,int year,char note[255]) {
 struct node* n=create_node(day,month,year,note);
 if (s.start==NULL) {
 s.start=n;
 ptr=n;
 }
 else {
 ptr->next=n;
 ptr=ptr->next;
 }
}
void displayNotes() {
 if (s.start==NULL) printf("no notes to display\n");
 else {
 printf("here are your notes\nDAY\tMONTH\tYEAR \t\tNOTES\n");
 for(struct node *str=s.start;str!=NULL;str=str->next) {
 printf("%d\t%d\t%d \t\t%s\n",str->day,str->month,str->year,str->note);
 }
 }
 printf("\n\n");
}

int checkSchedule(struct qnode *front,float stime,float etime) {
 struct qnode *ptr=front;
 while(ptr!=NULL&&(stime!=ptr->stime&&(stime>ptr->etime||stime==ptr->etime||(stime<ptr->stime&&etime<=ptr->stime)))) {
 ptr=ptr->next;
 }
 if (ptr==NULL) return 1;
 else return 0;
}
void availableSchedule(struct qnode *front) {
 struct qnode *ptr=front;
 float avtime[SIZE]={0};
 avtime[0]=1;
 int i=1;
 while(ptr!=NULL) {
 avtime[i]=ptr->stime;
 avtime[i+1]=ptr->etime;
 i+=2;
 ptr=ptr->next;
 }
 avtime[i]=24.00;
 for(int i=0;avtime[i]!=0;i+=2) {
 if(avtime[i]!=avtime[i+1]) {
 printf("%0.2f--%0.2f \t",avtime[i],avtime[i+1]);
 }
 }
 printf("\n");
}


void printCalender(int m,int y) {
 const char *NameOfMonth[] = { NULL,
 "January", "February", "March", "April", "May", "June",
 "July", "August", "September", "October", "November", "December"
 };
 char Week[] = "Su Mo Tu We Th Fr Sa";
 int DayOfMonth[] =
 { -1,31,28,31,30,31,30,31,31,30,31,30,31 };
 int weekOfTopDay = days(y, m, 1) % 7;
 int t=weekOfTopDay;
 printf("\n %s %d\n%s\n", NameOfMonth[m], y, Week);
 for(int i=0;i<weekOfTopDay;i++)
 printf(" ");
 for(int i=0;i<DayOfMonth[m];i++) {
 if (i<9)
 printf("%d ",i+1);
 else
 printf("%d ",i+1);
 t++;
 if(t==7||t==14||t==21||t==28||t==35) printf("\n");
 }
 printf("\n");
}
struct qnode* SortedMerge(struct qnode* a, struct qnode* b) {
 struct qnode* result = NULL;
 if (a == NULL)
 return(b);
 else if (b==NULL)
 return(a);
 if (a->stime <= b->stime) {
 result = a;
 result->next = SortedMerge(a->next, b);
 }

 else {
 result = b;
 result->next = SortedMerge(a, b->next);
 }
 return(result);
}

void partition(struct qnode* source,struct qnode** frontRef, struct qnode** backRef) {
 struct qnode* fast;
 struct qnode* slow;
 slow = source;
 fast = source->next;
 while (fast != NULL) {
 fast = fast->next;
 if (fast != NULL) {
 slow = slow->next;
 fast = fast->next;
 }
 }
 *frontRef = source;
 *backRef = slow->next;
 slow->next = NULL;
}


void MergeSort(struct qnode** headRef) {
 struct qnode* head = *headRef;
 struct qnode* a;
 struct qnode* b;
 if ((head == NULL) || (head->next == NULL)) {
 return;
 }
 partition(head, &a, &b);
 MergeSort(&a);
 MergeSort(&b);
 *headRef = SortedMerge(a, b);
}

void printqueue(int j) {
 if(q[j].rear==NULL) {
 printf("Schedule is empty\n");
 }
 else {
 struct qnode *node=q[j].front;
 MergeSort(&node);
 printf("\t %d--%d--%d\n",node->day,node->month,node->year);
 while(node!=NULL) {
 printf("%0.2f-%0.2f\t\t%s\n",node->stime,node->etime,node->sch_name);
 node=node->next;
 }
 printf("\n\n");
 }
 return;
}

void addSchedule(int d,int m,int y) {//schedule a day(queue using LL)
 int choice=1,check=1;

 while(choice==1) {
 printf("enter name of schedule\n");
 char sch_name[SIZE]; scanf("%s",sch_name);
 printf("enter starting time of event in 24 hrs format\n");
 float stime; scanf("%f",&stime);
 printf("enter end time of event in 24 hrs format\n");
 float etime; scanf("%f",&etime);
 if (etime<=stime) {
 printf("end time of event should be greater than start time");
 while(etime<=stime) {
 printf("enter end time of event in 24 hrs format\n");
 scanf("%f",&etime);
 }
 }
 if(q[i].rear!=NULL) check=checkSchedule(q[i].front,stime,etime);

 if(check==0) {
 printf("this timining slot is FULL\n These are available slots");
 availableSchedule(q[i].front);
 }
 else {
 enque(d,m,y,stime,etime,sch_name);
 printf("To continue adding press 1\n");
 scanf("%d",&choice);
 }
 }
 printqueue(i);
}





int main() {
 s.start=NULL;
 for(int i=0;i<SIZE;i++) {
 q[i].front=NULL;
 q[i].rear=NULL;
 }
 struct qq *ptr=&q[0];

 int day,month,year;
 char choice,note[255];
 int deq,k,kt,flag=0;
 int choice2;
 int hours,min,sec,dAy,mOnth,yEar;
 time_t now;
 time(&now);
 struct tm *local=localtime(&now);
 hours=local->tm_hour;
 min=local ->tm_min;
 sec=local->tm_sec;
 dAy=local->tm_mday;
 mOnth=local->tm_mon+1;
 yEar=local->tm_year+1900;
 if (hours<12) printf("TIme is %02d:%02d:%02dam\n",hours,min,sec);
 else printf("TIme is %02d:%02d:%02dpm\n\n",hours-12,min,sec);
 printf("Date is %02d:%02d:%d\n\n\n",dAy,mOnth,yEar);
 while (1) {
 printf("1. Print calendar of a month and schedule your day\n");//complete but correction remaining at checksc
 printf("2. mark your schedule as done\tyou cannot press 2 without adding schedule\n");//complete
 printf("3. print your schedules\n");//complete
 printf("4. Add Important Note\n");//complete
 printf("5. display Important Notes\n");//complete
 printf("6. delete an added note \n");//complete
 printf("7. EXIT\n");
 printf("Enter your choice: \n");
 scanf("\n%c", &choice);
 switch (choice) {
 case '1':
 printf("Enter the month and year: ");
 scanf("%d %d", &month, &year);
 if (month>12)
 printf("incorrect date\n");
 else {
 printCalender(month,year);
 printf("press 1 to schedule your day\t");
 scanf("%d",&choice2);
 if (choice2==1) {
 printf("enter the day on which schedule is to be added\n");
 scanf("\n%d",&day);
 if (day>31) {
 printf("sorry but there are atmost 31 days in a month\n");
 while (day>31) {
 printf("enter day again\n");
 scanf("\n%d",&day);
 }
 }
 i++;
 if (year<(yEar-2000)||(year==(yEar-2000)&&month<mOnth)||(year==(yEar-2000)&&month==mOnth&&day<dAy)) {
 printf("cannot schedule past day or incorrect date\n\n");
 }
 else addSchedule(day,month,year);
 }
 }
 break;
 case '2':
 printf("here is YOUR TODAYS SCHEDULE\n\n");
 if (q[0].front==NULL) printf("you dont have any schedules\n");
 else {
 for(k=0;k<=i;k++) {
 if(q[k].front->day==dAy&&q[k].front->month==mOnth&&q[k].front->year==(yEar-2000)) {
 flag=1;
 break;
 }
 }
 if(k>i) k=i;
 if (flag==0) printf("you have no schedules for today\n\n\n");
 else {
 printqueue(k);
 printf("\thow many task/s you want to mark as done\t");
 scanf("%d",&deq);
 for(int j=0;j<deq;j++) {
 deque(k);
 }
 flag=0;
 }
 }
 break;
 case '3':
 for(int j=0;j<=i;j++) {
 printqueue(j);
 }
 break;
 case '4':
 printf("enter the day month and year on which note is to be added\t");
 scanf("%d %d %d",&day,&month,&year);
 if (day>31||month>12||year<(yEar-2000)||(year==(yEar-2000)&&month<mOnth)||(year==(yEar-2000)&&month==mOnth&&day<dAy))
 printf("incorrect or past date\n");
 else {
 printf("enter NOTE\n");
 scanf("%s",note);
 addNote(day,month,year,note);
 printf("note added at date %d %d is %s\n",day,month,note);
 }
 break;
 case '5':
 displayNotes();
 break;
 case '6':
 displayNotes();
 printf("enter the note you want to delete\t");
 char del_note[255];
 scanf("%s",del_note);
 delete(del_note);
 break;
 case '7':
 exit(1);
 }
 }
}

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