#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <dos.h>

void main_menu();
void create_marksheet();
void delete_marksheet();
void view_marksheet();
void switch_case(int);

typedef struct
{
 long roll;
 int marks[6], total,i;
 float p;
 char fname[20],lname[10], result[6];
}student;

FILE *fp, *tfp;

student s;

char cont;
int i;

void main()
{
 clrscr();
 main_menu();
}

void main_menu()
{
 int ch;
 textcolor(9);
 for(i=0;i<42;i++)
 {
  gotoxy(25+i,5);
  printf("%c",254);
 }
 printf("nttt      Sagarmatha Engineering College");
 printf("nttt    Department of Computer Engineering");
 for(i=0;i<42;i++)
 {
  gotoxy(25+i,8);
  printf("%c",254);
 }
 printf("nntttt   Select Operationn");
 for(i=0;i<18;i++)
 {
  gotoxy(35+i,11);
  printf("%c",254);
 }
 printf("ntttt 1. Create Marksheetntttt 2. View Marksheetntttt 3. Delete Marksheetntttt 4. Exit");
 printf("nnnnnttt    Enter your choice (1-2-3-4):");
 scanf("%d", &ch);
 switch_case(ch);
}

void create_marksheet()
{
 int i,j;
 char cont1;
 clrscr();
 textcolor(9);
 fp=fopen("data.txt","a+");
 if(fp==NULL)
 {
  printf("nnFile could not be created !!");
  printf("nnPress any key to continue.....");
  getch();
  exit(0);
 }
 printf("Enter Your First Name:");
 scanf("%s",s.fname);
 printf("Enter Your Last Name:");
 scanf("%s",s.lname);
 printf("Enter Your Roll Number:");
 scanf("%ld",&s.roll);

 printf("Enter your marks in Computer Programming:");
 scanf("%d", &s.marks[0]);

 printf("Enter your marks in Engineering Mathematics I:");
 scanf("%d", &s.marks[1]);

 printf("Enter your marks in Basic Electrical Engineering:");
 scanf("%d", &s.marks[2]);

 printf("Enter your marks in Engineering Physics:");
 scanf("%d", &s.marks[3]);

 printf("Enter your marks in Engineering Drawing I:");
 scanf("%d", &s.marks[4]);

 printf("Enter your marks in Applied Mechanics:");
 scanf("%d", &s.marks[5]);

 for(i=0;i<6;i++)
 {
  s.total+=s.marks[i];
 }
 for(i=0;i<6;i++)
 {
  if(s.marks[i]<40)
  {
   s.total=0;
   s.p=0.0;
   strcpy(s.result,"FAILED");
   break;
  }
  else
  {
   s.p= (float) s.total/6.0;
   strcpy(s.result,"PASSED");
  }
 }
 fwrite(&s,sizeof(s),1,fp);

 printf("nnnnnnnnnnttt  Record successfully entered!");
 printf("nnntttPress any key to continue.......n");
 fflush(stdin);
 fclose(fp);
 getch();
 clrscr();
 main_menu();
}

void delete_marksheet()
{
 int i,j,k;
 char name_d[10];
 clrscr();
 textcolor(9);
 textbackground(0);
 printf("Enter name to delete:");
 scanf("%s", name_d);
 fp=fopen("data.txt", "r+");
 tfp=fopen("temp","wb+");
 if(fp==NULL|| tfp==NULL)
  exit(0);
 while(fread(&s,sizeof(s),1,fp)==1)
 {
  if(strcmp(s.fname, name_d)==0)
  {
   continue;
  }
  else
  {
   fwrite(&s, sizeof(s),1,tfp);
  }
 }
 remove("data.txt");
 rename("temp", "data.txt");
 fclose(fp);
 fclose(tfp);
 clrscr();
 main_menu();
}


void view_marksheet()
{
 int i,j, found=0;
 long vroll;
 char cont2, name_v[10];
 fp=fopen("data.txt","r+");
 if(fp==NULL)
  exit(0);
 clrscr();
 textcolor(9);
 textbackground(0);
 printf("Enter name to view the marksheet:");
 scanf("%s",name_v);
 while(fread(&s,sizeof(s),1,fp)==1)
 {
  if(strcmp(s.fname,name_v)==0)
  {
   s.fname[0]=toupper(s.fname[0]);
   s.lname[0]=toupper(s.lname[0]);
   printf("nName: %s %sn", s.fname, s.lname);
   printf("nRoll Number: %ldn", s.roll);
   printf("nt==============================================================n");
   printf("ttSubject ttt    Marks Obtained");
   printf("nt==============================================================nn");
   printf("ttComputer Programming ttt %dn", s.marks[0]);

   printf("ttEngineering Mathematics Itt %dn", s.marks[1]);

   printf("ttBasic Electrical Engineeringtt %dn",s.marks[2]);

   printf("ttEngineering Physics ttt %dn", s.marks[3]);

   printf("ttEngineering Drawing I ttt %dn", s.marks[4]);

   printf("ttApplied Mechanics ttt %dn", s.marks[5]);
   printf("nt==============================================================nn");
   if(s.total==0)
    printf("tTotal Marks: --n");
   else
    printf("tTotal Marks: %dn", s.total);
   if(s.p==0.0)
    printf("ntPercentage: -- n");
   else
    printf("ntPercentage: %.2fn", s.p);
   printf("ntResult: %s", s.result);
   printf("nntttPress any key to continue.....");
   fclose(fp);
   getch();
   found=1;
   clrscr();
   main_menu();
   break;
  }
 }
 if(found==0)
 {
  clrscr();
  printf("nnntttt %s not found!n", name_v);
  printf("nttt     Press any key to continue....");
  getch();
  clrscr();
  main_menu();
 }
}


void switch_case(int x)
{
 switch(x)
 {
  case 1:
   create_marksheet();
  break;

  case 2:
   view_marksheet();
  break;

  case 3:
   delete_marksheet();
  break;

  case 4:
   exit(0);
  break;

  default:
         clrscr();
         textcolor(9);
         textbackground(0);
         printf("nnInvalid Choice!");
         printf("nPress any key to continue....");
         getch();
         clrscr();
         main_menu();
  break;
 }

}