SIAKAD LINKED LIST

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

typedef struct mhs{
    char nama[100];
    char NRP[100];
    float EAS;
    float ETS;
    float rata;
    struct mhs* sambung;
}mhs;
    mhs data[100];
int i;
//int temp;
mhs *awal;

void awali();
void input ()
{   //temp=0;
    FILE *daleman;
    daleman=fopen("data.bin", "ab");
    char ans[1] = "Y";
    system("cls");
    mhs *dwi;
    while(ans[0]=='Y' ||ans[0]=='y')
    {
        dwi =(mhs*) malloc(sizeof(mhs));
    //printf("%d",temp);
    printf("Nama Mahasiswa\t: ");gets(dwi->nama);
        fprintf(daleman,"Nama Mahasiswa\t: %s\n", dwi->nama);
    printf("NRP Mahasiswa\t: ");gets(dwi->NRP);
        fprintf(daleman,"NRP Mahasiswa\t: %s\n", dwi->NRP);
    printf("Nilai ETS\t: ");scanf("%f",&dwi->ETS);
        fprintf(daleman,"Nilai ETS\t: %.0f\n",dwi->ETS);
    printf("Nilai EAS\t: ");scanf("%f",&dwi->EAS);
        fprintf(daleman,"Nilai EAS\t: %.0f\n",dwi->EAS);
        fprintf(daleman,"Nilai Rata-rata\t: %.2f\n\n",(dwi->EAS+dwi->ETS)/2);
     //getchar();
    //data[temp].rata=(data[temp].EAS + data[temp].ETS)/2;
//  printf("%s %s %f %f",data[i].nama,data[i].NRP, data[i].EAS, data[i].ETS);
    //temp+=1;
    dwi->sambung=NULL;

    if(awal==NULL) awal=dwi; // menghubungkan struct
    else{   //untuk masukin data baru dari struct yg dah terhubung
        mhs *dwi1;
        dwi1 =awal;
        while(dwi1->sambung!=NULL) //ngecek ampe mentok
        {
            dwi1 =dwi1->sambung;
        }
        dwi1->sambung=dwi;
    }
    printf("Lanjut Pengisian Data ? (Y/T) "); ans[0] = getchar();getchar();
    printf("\n");
    }
    //i=temp;
    //temp=i+1;
    //printf("%d",i);
    //int k;
//  return i;
    fclose(daleman);
    awali();
}

// void rata()
//{ system("cls");
//  int c = 0;
//  for(c=0;c<i;c++)
//  {
//  printf("Nama Mahasiswa\t: %s\n",data[c].nama);
//  printf("NRP Mahasiswa\t: %s\n",data[c].NRP);
//  printf("Nilai Rata-Rata\t: %.2f\n\n",data[c].rata);
//  }printf("Tekan Enter untuk Kembali ke menu awal") ;getchar();
//      //int k;
//  awal();
//
//}

void tampil()
{ system("cls");
FILE *daleman;
    daleman=fopen("data.bin", "rb");
//mhs *dwi2; dwi2=awal;
//printf("%d",i);
char isi;
int cekin = fscanf(daleman,"%c",&isi);
    while( cekin !=EOF)
    {
        printf("%c",isi);
        //printf("%s",daleman);
    //printf("Nama Mahasiswa\t: %s\n",dwi2->nama);
//  printf("NRP Mahasiswa\t: %s\n",data[c].NRP);
//  printf("Nilai ETS\t: %.1f\n",data[c].ETS);
//  printf("Nilai EAS\t: %.1f\n",data[c].EAS);
//  printf("Nilai Rata-Rata\t: %.2f\n\n",data[c].rata);
//dwi2 = dwi2->sambung;
cekin = fscanf(daleman,"%c",&isi);
    }
    printf("Tekan Enter untuk Kembali ke menu awal"); getchar();
        //int k;
        fclose(daleman);
    awali();
}
void awali()
{system("cls");
int n;

    printf("--------------------------------------\n\nD A T A B A S E - D A T A B A S E A N\n\n");  printf("--------------------------------------\n\nD A T A B A S E - D A T A B A S E A N\n\n");
    FILE *daleman, *luaran;
    daleman=fopen("data.bin", "ab");
    printf("1. Input Data\n2. Tampilkan Data\n3. Exit\n\n");\
    printf("Masukkan Nomor perintah : ");
    scanf("%d",&n);getchar();
//printf("%d",i);
    switch(n)
    {
        case 1 : input(); break;
    //  case 2 : rata(); break;
        case 2 : tampil(); break;
        default : system("cls");printf("    T E R I M A  K A S I H"); break;

    }
}

int main(){
//  int n;

awali();
//  printf("--------------------------------------\n");
    return 0;
}