[codes=c]#include
#include
#include
#include

#define MAX 100
#define TOAN 0
#define LY   1
#define HOA  2

struct sinhvien {
  char mslop[5];
  char hoten[35];
  float diem[3];
} danhsach[MAX];
int n = 0;

void nhapmoi()
{
  char mslop[5], tmp[3];
  int i;
  float diem[3];
  do {
    printf("\nCho biet ma so lop : ");
    gets(mslop);
    if (strlen(mslop))
    {
      strcpy(danhsach[n].mslop, mslop);
      printf("\nCho biet ho ten : ");
      gets(danhsach[n].hoten);
      printf("\nCho biet diem so : ");
      for (i=0; i<3; i++)
      {
        scanf("%f", &diem[i]);
        danhsach[n].diem[i] = diem[i];
      }
      gets(tmp);
      n++;
    }
  } while (strlen(mslop));
}

void timkiem()
{
  char mslop[5];
  int i = 0, found = 0;
  printf("\nCho biet ma so lop : ");
  gets(mslop);
  if (strlen(mslop))
    while (i<n)
      if (stricmp(danhsach[i].mslop, mslop) == 0)
      {
         printf("\nMa so lop : %s", danhsach[i].mslop);
         printf("\nHo va ten : %s", danhsach[i].hoten);
         printf("\nDiem Toan : %f", danhsach[i].diem[TOAN]);
         printf("\nDiem Ly   : %f", danhsach[i].diem[LY]);
         printf("\nDiem Hoa  : %f", danhsach[i].diem[HOA]);
         found = 1;
         break;
      }
      else
        i++;
  if (!found)
    printf("\nKhong tim thay!!!");
}

void xoa()
{
  char mslop[5], traloi;
  int i = 0, j;
  printf("\nCho biet ma so lop : ");
  gets(mslop);
  if (strlen(mslop))
    while (i<n)
      if (stricmp(danhsach[i].mslop, mslop) == 0)
      {
         printf("\nMa so lop : %s", danhsach[i].mslop);
         printf("\nHo va ten : %s", danhsach[i].hoten);
         printf("\nDiem Toan : %f", danhsach[i].diem[TOAN]);
         printf("\nDiem Ly   : %f", danhsach[i].diem[LY]);
         printf("\nDiem Hoa  : %f", danhsach[i].diem[HOA]);
         printf("\nCo muon xoa khong (C/K)? ");
         do {
           traloi = toupper(getch());
         } while (traloi != ‘C’ && traloi != ‘K’);
         putc(traloi, stdout);
         if (traloi == ‘C’)
         {
           n–;
           memcpy(&danhsach[i], &danhsach[i+1], sizeof(struct sinhvien) * (n-i));
           break;
         }
      }
      else
        i++;
}

void menu()
{
  printf("\n");
  printf("\n 1. Them     ");
  printf("\n 2. Xoa      ");
  printf("\n 3. Tim kiem ");
  printf("\n 0. Thoat    ");
  printf("\n");
  printf("\nChon lua ? ");
}

void main()
{
  char traloi;
  do {
    menu();
    do {
      traloi = getch();
    } while (traloi < ‘0’ || traloi > ‘3’);
    putc(traloi, stdout);
    switch (traloi)
    {
       case ‘1’ : nhapmoi();
                  break;
       case ‘2’ : xoa();
                  break;
       case ‘3’ : timkiem();
                  break;
    }
  } while (traloi != ‘0’);
}[/codes]

Last modified on March 31st, 2021 at 1:35 am

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