#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
//Function Prototype
void add( struct student s[] );
void deleting( struct student s[] );
void update( struct student s[] );
void view( struct student s[] );
void calculateAvg( struct student s[] );
void max( struct student s[] );
/*void min( struct student s[] );
void find( struct student s[] );
void sort( struct student s[] );*/
//Size
int size = 0;
//Structure
struct student{
int id;
char name[25];
char sex; // M(Male) || F(Female)
int q1,q2,mid,final,total;

 }s[20];

int main()
{

int choice;

system("CLS");

printf("n==========================");
printf("n         MENU");
printf("n==========================");

printf("n1. Add student records");
printf("n2. Delete student records");
printf("n3. Update student records");
printf("n4. View all student records");
printf("n5. Calculate an average of a selected student’s scores");
printf("n6. Show student who gets the max total score");
printf("n7. Show student who gets the min total score");
printf("n8. Find student by ID");
printf("n9. Sort records by total scores");
printf("n10. EXIT!");

printf("nn Please enter your choice:  ");
scanf("%d",&choice);

switch(choice)
{
    case 1: add(s);break;
    case 2: deleting(s);break;
    case 3: update(s);break;
    case 4: view(s);break;
    case 5: calculateAvg(s);break;
    case 6: max(s);break;
    /*case 7: min(s);break;
    case 8: find(s);break;
    case 9: sort(s);break;
    case 10: exit(1);break;*/
}

getch();

}

void add( struct student s[] )
{
char choice;
int j;

system("CLS");

printf("nPlease enter student no.%d information below:n",size+1);
printf("ID : ");
scanf("%d",&s[size].id);
printf("Name : ");
scanf("%s",&s[size].name);
printf("Sex [M=Male||F=Female] : ");
scanf(" %c",&s[size].sex);
printf("Quiz1: ");
scanf("%d",&s[size].q1);
printf("Quiz2: ");
scanf("%d",&s[size].q2);
printf("Mid-term: ");
scanf("%d",&s[size].mid);
printf("Final: ");
scanf("%d",&s[size].final);

++size;

printf("ADD PROCESS COMPLETE!");
printf("    SIZE=%d",size);
printf("nPRESS (R) TO RETURN, PRESS (A) TO ADD: ");
scanf(" %c",&choice);

if ( choice == 'R' || choice == 'r')
main();
else if ( choice == 'a' || choice == 'A')
add(s);

getch();

}


void deleting( struct student s[] )
{
int num,i,j,flag=0;
char choice;

system("CLS");

printf("Please enter student ID to delete: ");
scanf("%d",&num);

for ( i=0; i<size; ++i)
{
    if ( s[i].id == num )
    {
        for (j=i; j<size; ++j)
        {
            s[j] = s[j+1];

        }
        --size;
        flag=1;
        break;
    }
}



if (flag==1)
printf("DELETE PROCESS IS DONE!");
else if (flag==0)
printf("ERROR!!");

printf("nPRESS (R) TO RETURN, PRESS (D) TO DELETE: ");
scanf(" %c",&choice);

if ( choice == 'R' || choice == 'r')
main();
else if ( choice == 'D' || choice == 'd')
deleting(s);



getch();
}


void update( struct student s[] )
{
int i,num,flag=0;
char choice;

system("CLS");

printf("Please enter student ID to update: ");
scanf("%d",&num);

for ( i=0; i<size; ++i)
{
    if ( s[i].id == num )
    {
        flag=1;
        printf("nStudent no.%d information:n",i+1);
        printf("ID:%d |",s[i].id);
        printf("Name:%s |",s[i].name);
        printf("Sex:%c |",s[i].sex);
        printf("Quiz1:%d |Quiz2:%d |Mid-term:%d |Final:%d |",s[i].q1,s[i].q2,s[i].mid,s[i].final);

        printf("nnPlease enter new inforamtion to update: nn");

            printf("ID : ");
            scanf("%d",&s[i].id);
            printf("Name : ");
            scanf("%s",&s[i].name);
            printf("Sex [M=Male||F=Female] : ");
            scanf(" %c",&s[i].sex);
            printf("Quiz1: ");
            scanf("%d",&s[i].q1);
            printf("Quiz2: ");
            scanf("%d",&s[i].q2);
            printf("Mid-term: ");
            scanf("%d",&s[i].mid);
            printf("Final: ");
            scanf("%d",&s[i].final);

            break;

    }

}


if (flag==1)
    printf("UPDATE PROCESS IS DONE!");
else if (flag==0)
    printf("ERROR!!");

printf("nPRESS (R) TO RETURN, PRESS (U) TO UPDATE: ");
scanf(" %c",&choice);

if ( choice == 'R' || choice == 'r')
main();
else if ( choice == 'U' || choice == 'u')
update(s);

getch();
}


void view( struct student s[] )
{
char choice;
//system("CLS"); may be added if wanted.
for (int j=0; j<size; ++j)
{
    printf("nStudent no.%d information:n",j+1);
    printf("ID:%d |",s[j].id);
    printf("Name:%s |",s[j].name);
    printf("Sex:%c |",s[j].sex);
    printf("Quiz1:%d |Quiz2:%d |Mid-term:%d |Final:%d |",s[j].q1,s[j].q2,s[j].mid,s[j].final);

}

printf("nnSIZE=%d",size);

printf("nPRESS (R) TO RETURN :");
scanf(" %c",&choice);

if ( choice == 'R' || choice == 'r')
main();

getch();

 }


 void calculateAvg( struct student s[] )
{
int i,total,flag=0,num;
char choice;

    system("CLS");

printf("Please enter student ID to calculate average of marks: ");
scanf("%d",&num);

for ( i=0; i<size; ++i)
{
    if ( s[i].id == num )
    {
        s[i].total = s[i].q1 + s[i].q2 + s[i].mid + s[i].final;

        printf("nn            Student no.%d information:n",i+1);
        printf("ID:%d |",s[i].id);
        printf("Name:%s |",s[i].name);
        printf("Sex:%c |",s[i].sex);
        printf("Quiz1:%d |Quiz2:%d |Mid-term:%d |Final:%d |",s[i].q1,s[i].q2,s[i].mid,s[i].final);

        printf("nn        TOTAL = %d",s[i].total);
        printf("n      AVERAGE = %d",s[i].total/4);

        flag=1;
    }
    break;
}

 if (flag==1)
    printf("nnAVERAGE CALCULATED!");
else if (flag==0)
    printf("ERROR!!");

printf("nPRESS (R) TO RETURN :");
scanf(" %c",&choice);

if ( choice == 'R' || choice == 'r')
main();


getch();

}


void max( struct student s[] )
{
int i,max;
s[i].total = s[i].q1 + s[i].q2 +s[i].mid + s[i].final
max = s[0].total;

for (i=0; i<size; ++i)
{
    if ( s[i].total > max )
    {
            max = s[i].total;
    }
}

printf("nHighest total score is %d belongs to student ID (%d)",max,)//\problem
 }