Simple Shorting

#include <iostream>
#include <stdlib.h>
#define maks 100

using namespace std;

int angka[maks];
int indeks=-1;

void tambahData(){
    indeks++;
    cout << "Masukkan angka :";
    cin >> angka[indeks];
}

void view(){
    if(indeks!=-1){
        cout << "Data : ";
        for(int i=0;i<=indeks;i++){
            cout << angka[i] << " ";
        }
    }
}

void urutkanMenaik(){
    int tmp;
    for(int i=0;i<=indeks;i++){
        for(int j=0;j<=indeks;j++){
            if(angka[i]<angka[j]){
                tmp = angka[i];
                angka[i] = angka[j];
                angka[j] = tmp;
            }
        }
    }
}

void acak(){
    int tmp;
    for(int i=0;i<=indeks;i++){
        for(int j=indeks;j>=i+1;j--){
            tmp = angka[i];
            angka[i] = angka[j];
            angka[j] = tmp;
        }
    }
}

void urutkanMenurun(){
    int tmp;
    for(int i=0;i<=indeks;i++){
        for(int j=0;j<=indeks;j++){
            if(angka[i]>angka[j]){
                tmp = angka[i];
                angka[i] = angka[j];
                angka[j] = tmp;
            }
        }
    }
}

void ulang(){
    indeks = -1;
}

int main()
{
    int menu;
    do{
        system("cls");
        view();
        cout << endl << endl;
        cout << "Menu : " << endl;
        cout << "1. Tambah Data" << endl;
        cout << "2. Urutkan Menaik" << endl;
        cout << "3. Urutkan Menurun" << endl;
        cout << "4. Acak" << endl;
        cout << "5. Ulang" << endl;
        cout << "6. Keluar" << endl;
        cout << "Masukkan menu :";
        cin >> menu;

        if(menu == 1){
            tambahData();
        }else if(menu == 2){
            urutkanMenaik();
        }else if(menu == 3){
            urutkanMenurun();
        }else if(menu == 4){
            acak();
        }else if(menu == 5){
            ulang();
        }

    }while(menu != 6);
}