input search delete

#include <iostream>
#include <cstring>
#include <stdlib.h>
using namespace std;
int main()

{
    char data[30][100];
    char npm[30][100];
    char cari[100];
    int pilih;
    char ulang;
    int banyak=0, kounter;

    do{
    system("CLS");
    cout<<"\tmenu"<<endl;
    cout<<"i.input"<<endl;
    cout<<"2.Insert"<<endl;
    cout<<"3.search"<<endl;
    cout<<"4.delete"<<endl;
    cout<<"================"<<endl;

    cout<<"masukkan pilihan anda = ";
    cin>>pilih;
    cout<<endl;

    switch(pilih)
    {
        case 1 :
            cout<<"Masukan banyak data yang ingin di input= ";
            cin>>banyak;
            cin.ignore();
            for(kounter=0; kounter<banyak; kounter++){
            system("CLS");
            cout<<"input Data ke-"<<kounter+1<<endl;
            cout<<"masukkan NPM = (xx.xxxx.x.xxxxx)\n";
            cin.getline(npm[kounter], 100);
            cout<<"masukkan nama = ";
            cin.getline(data[kounter], 100);
            }
            system("CLS");
            cout<<"Terima Kasih data sudah berhasil di input";
            break;
        case 2:
            system("CLS");
            if(banyak!=0){
            cout<<"No\t\tNPM\t\t\tNama"<<endl;
            for(kounter=0; kounter<banyak; kounter++){
                    if(data[kounter][0]!='\0'){
            cout<<kounter+1<<"\t\t";
            cout<<npm[kounter]<<"\t\t";
            cout<<data[kounter]<<endl;
                    }
            }
            }
            else{
                cout<<"Data Kosong";
            }
            break;

        case 3 :
            system("CLS");
            int ketemu;
            ketemu=0;
            if(banyak!=0){
            cin.ignore();
            cout<<"Search\n";
            cout<<"1. Cari Data melalui Nama\n";
            cout<<"2. Cari Data melalui NPM\n";
            cout<<"3. Cara Data melalui Urutan\n";
            cout<<"Masukan Pilihan Anda = ";
            cin>>pilih;
            cin.ignore();
            switch(pilih){
            case 1:
            cout<<"Masukan Nama = ";
            cin.getline(cari, 100);
            for(kounter=0; kounter<banyak; kounter++){
                if(strcmp(data[kounter], cari)==0 || strcmp(data[kounter], cari)==1){
                    cout<<"NPM  : "<<npm[kounter]<<endl;
                    cout<<"Nama : "<<data[kounter]<<endl;
                    ketemu=1;

                }
                if(kounter==banyak-1 && ketemu != 1){
                    cout<<"Data Tidak Ditemukan";
                }
            }
            break;
            case 2:
            cout<<"Masukan NPM = (xx.xxxx.x.xxxxx)\n";
            cin.getline(cari, 100);
            for(kounter=0; kounter<banyak; kounter++){
                if(strcmp(npm[kounter], cari)==0){
                    cout<<"NPM  : "<<npm[kounter]<<endl;
                    cout<<"Nama : "<<data[kounter]<<endl;
                    ketemu=1;

                }
                if(kounter==banyak-1 && ketemu != 1){
                    cout<<"Data Tidak Ditemukan";
                }
            }
            break;
            case 3:
                int urut;
            cout<<"Masukan Urutan = ";
            cin>>urut;
            for(kounter=0; kounter<banyak; kounter++){
                if(kounter==urut-1){
                    cout<<"NPM  : "<<npm[kounter]<<endl;
                    cout<<"Nama : "<<data[kounter]<<endl;
                    ketemu=1;

                }
                if(kounter==banyak-1 && ketemu != 1){
                    cout<<"Data Tidak Ditemukan";
                }
            }
            break;
            default:
            break;
            }
            }
            else{
                cout<<"Data Kosong";
            }
            break;
        case 4:
            char cari[100];
            cout<<"1. Hapus Melalui Nama\n";
            cout<<"2. Hapus Melalui Urutan\n";
            cout<<"Masukan Pilihan anda = ";
            cin>>pilih;
            cin.ignore();
            switch(pilih){

            case 1:
            ketemu=0;
            if(banyak!=0){
            cout<<"Masukan Nama = ";
            cin.getline(cari, 100);
            for(kounter=0; kounter<banyak; kounter++){
                if(strcmp(data[kounter], cari)==0){
                    cout<<"\nData ke-"<<kounter+1<<" Berhasil Dihapus";
                    data[kounter][0]='\0';
                    npm[kounter][0]='\0';
                    /*for(int i=kounter; i<banyak; i++){
                        strcpy(data[i], data[i+1]);
                        strcpy(npm[i], npm[i+1]);
                    }
                    data[banyak-1][0]='\0';*/
                    ketemu=1;
                }
                if(kounter==banyak-1 && ketemu != 1){
                cout<<"Data Tidak Ditemukan\n";
            }
            }
            }
            else{
                cout<<"Data Kosong";
            }
            break;

            case 2 :
            int hapus;
            ketemu=0;
            if(banyak!=0){
            cin.ignore();
            cout<<"masukkan data keberapa yang ingin dihapus = ";
            cin>>hapus;
            for(kounter=0; kounter<banyak; kounter++){
                if(kounter==hapus-1){
                    cout<<"\nData ke-"<<hapus<<" Berhasil Dihapus";
                    data[kounter][0]='\0';
                    npm[kounter][0]='\0';
                    /*for(int i=kounter; i<banyak; i++){
                        strcpy(data[i], data[i+1]);
                        strcpy(npm[i], npm[i+1]);
                    }
                    data[banyak-1][0]='\0';*/
                ketemu=1;
                }
            if(kounter==banyak-1 && ketemu != 1){
                    cout<<"Data Tidak Ditemukan\n";
                }
            }
            }
            else{
                cout<<"Data Kosong";
            }
            break;

            default :
                cout<<"Pilihan Tidak tersedia";
                break;
        }
        break;

        default:
            cout << "pilihan anda tidak ada";
            break;

    }
    cout<<"\nKembali ke Menu Utama [y/n]? ";cin>>ulang;
}while(ulang=='y');
}