#include<iostream.h>

#include<stdio.h>

#include<string.h>

#include<conio.h>

#include<ctype.h>

#define MAX 100

typedef struct hocsinh {

  char hoten[35];

  char lop[7];

  float diemtoan, diemly, diemhoa;

} HOCSINH;

HOCSINH danhsach[MAX];

int r = 0;

int menu()

{

  char c;

  clrscr();

  cout<<"+----- Menu -----+";

  cout<<"

+----------------+";

  cout<<"

+ 1. Nhap        +";

  cout<<"

+ 2. Xoa         +";

  cout<<"

+ 3. Sua doi     +";

  cout<<"

+ 4. Liet ke     +";

  cout<<"

+----------------+";

  cout<<"

+ 0. back menu       +";

  cout<<"

+----------------+";

  cout<<"

Chon muc : ";

  do {

    c = getch();

  } while (c<'0' || c>'6');

  return c-'0';

}

void nhapmoi()

{

  int ok = 0;

  char hoten[35];

  float diem;

  do {

    cout<<"

Ho ten (enter = back menu) : ";

    gets(hoten);

    if (strlen(hoten) == 0)

      ok = 1;

    else

    {

      strcpy(danhsach[r].hoten, hoten);

      printf("

Lop : ");

      gets(danhsach[r].lop);

      printf("

Diem toan : ");

      scanf("%f", &diem);

      danhsach[r].diemtoan = diem;

      printf("

Diem ly : ");

      scanf("%f", &diem);

      danhsach[r].diemly = diem;

      printf("

Diem hoa : ");

      scanf("%f", &diem);

      danhsach[r].diemhoa = diem;

      r++;

    }

  } while (!ok);

}

void xoa()

{

  int i, ok = 0, found, b[MAX];

  char hoten[35], ht[35];

  while (!ok)

  {

    if (r != 0)

    {

      printf("

Ho ten hoc sinh can xoa (enter = back menu) : ");

      gets(hoten);

      if (strlen(hoten) == 0)

            ok = 1;

      else

      {

            i = found = 0;

            do {

               strcpy(ht,danhsach[i].hoten);

              if (strcmp(strupr(hoten), strupr(ht)) == 0)

                b[found++] = i;

              i++;

            } while (i<r);

            if (!found)

              printf("

Khong tim thay hoc sinh co ten %s", hoten);

            else

            {

              for (i=0; i<found; i++)

              {

                printf("

%3d %-35s %-7s %4.1f %4.1f %4.1f", i+1, danhsach[b[i]].hoten,danhsach[b[i]].lop,

                 danhsach[b[i]].diemtoan, danhsach[b[i]].diemly, danhsach[b[i]].diemhoa);

              }

              printf("

Tim thay %d hoc sinh.", found);

              printf("

Chon thu tu muon xoa (neu muon huy bo thi chon so khong nam trong pham vi): ");

              scanf("%d", &i);

              if (i >= 1 && i <= found)

              {

                for (found=b[i-1]; found<r-1; found++)

                  danhsach[found] = danhsach[found+1];

                r--;

                printf("

Da xoa!");

              }

              else

                printf("

Viec xoa bi huy bo.");

            }

            ok = 1;

      }

      getch();

    }

    else

      ok = 1;

  }

}

void sua()

{

  int i, ok = 0, found, b[MAX];

  char hoten[35], ht[35];

  float diem;

  while (!ok)

  {

    if (r != 0)

    {

      printf("

Ho ten hoc sinh can sua (enter = back menu) : ");

      gets(hoten);

      if (strlen(hoten) == 0)

            ok = 1;

      else

      {

            i = found = 0;

            do {

               strcpy(ht,danhsach[i].hoten);

              if (strcmp(strupr(hoten), strupr(ht)) == 0)

                b[found++] = i;

              i++;

            } while (i<r);

            if (!found)

              printf("

Khong tim thay hoc sinh co ten %s", hoten);

            else

            {

              for (i=0; i<found; i++)

              {

                printf("

%3d %-35s %-7s %4.1f %4.1f %4.1f", i+1, danhsach[b[i]].hoten,danhsach[b[i]].lop,

                 danhsach[b[i]].diemtoan, danhsach[b[i]].diemly, danhsach[b[i]].diemhoa);

              }

              printf("

Tim thay %d hoc sinh.", found);

              printf("

Chon thu tu muon sua doi (neu muon huy bo thi chon so khong nam trong pham vi): ");

              scanf("%d%*c", &i);

              if (i >= 1 && i <= found)

              {

                printf("

%s

Ho ten : ", danhsach[b[i-1]].hoten);

                gets(danhsach[b[i-1]].hoten);

                printf("

%s

Lop : ", danhsach[b[i-1]].lop);

                gets(danhsach[b[i-1]].lop);

                printf("

%4.2f

Diem toan : ",danhsach[b[i-1]].diemtoan);

                scanf("%f", &diem);

                danhsach[b[i-1]].diemtoan = diem;

                printf("

%4.2f

Diem ly : ", danhsach[b[i-1]].diemly);

                scanf("%f", &diem);

                danhsach[b[i-1]].diemly = diem;

                printf("

%4.2f

Diem hoa : ", danhsach[b[i-1]].diemhoa);

                scanf("%f%*c", &diem);

                danhsach[b[i-1]].diemhoa = diem;

                printf("

Da thay doi");

              }

              else

                printf("

Viec thay doi bi huy bo.");

            }

            ok = 1;

      }

      getch();

    }

    else

      ok = 1;

  }

}

void lietke()

{

  int i;

  if (r != 0)

  {

    printf("

+-----+------------------------------------+--------+------+------+------+");

    printf("

| STT |         H O   V A   T E N          |  L O P | TOAN |  LY  |  HOA |");

    printf("

+-----+------------------------------------+--------+------+------+------+");

    for (i=0; i<r; i++)

    {

      printf("

| %3d | ", i+1);

      printf("%-35s| %-7s| %4.1f | %4.1f | %4.1f |", danhsach[i].hoten,danhsach[i].lop,

                 danhsach[i].diemtoan, danhsach[i].diemly, danhsach[i].diemhoa);

    }

    printf("

+-----+------------------------------------+--------+------+------+------+");

  }

  getch();

}

void main()

{

  int chon, ok = 0;

  do {

    chon = menu();

    switch(chon)

    {

      case 1 : nhapmoi();

                   break;

      case 2 : xoa();

                   break;

      case 3 : sua();

                   break;

      case 4 : lietke();

                   break;

      case 0 : ok = 1;

    }

  } while (!ok);

}