entire file with main commented

//Written by:  Mohamed Hamida (And Jennifer Martinez)
//Assignment:  Project 2
//Class:       Co Sci 243
//Date:        11/26/19
//Description: This is a project.z

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <conio.h>
#include <iomanip>
using namespace std;

void displayDescription();// X
void showMainMenu();// X
void showList(const int list[], int activeIndex, int numUsed);// X
void selectRight(int& activeIndex, int numUsed); // X
void selectLeft(int& activeIndex, int numUsed);// X
//void shiftLeft(int list[], int activeIndex, int numUsed);
//void shiftRight();
void moveLeft(int list[], int& activeIndex, int numUsed);// X
void moveRight(int list[], int& activeIndex, int numUsed);// X
void insertElem();
void deleteElem(int list[], int& activeIndex, int& numUsed);
void sortArray();
bool isLastSelected(int activeIndex, int numUsed);// X
bool isFirstSelected(int activeIndex, int numUsed);// X
bool isArrayFull(int numUsed);// X
bool isArrayEmpty(int numUsed);// X

int main()
{
    int list[10],activeIndex(0), scanCode(-1), numUsed(0),index(0); // variable declaration
    ifstream fin("input.txt"); // input

    if(fin.fail()){
        cout <<"File not found";
        exit(1);
    }else{
            fin >> activeIndex; // getting the first number from text file, putting it into activeIndex.
            while(fin >> list[index]){ // filling the rest of the array
                index++; // adding one to index so it can act like a for loop
                numUsed++; // adding one to array size (numUsed is how many elements in the array)
            }

            //  cout << numUsed << "$" ;
            //   cout << index << endl;

            do{
                system("CLS"); // clearing the screen
                showMainMenu(); //showing main menu
                showList(list, activeIndex, numUsed); // showing the array in correct format.

                scanCode = getch(); // getting the scanCode from user
                if(scanCode == 224 || scanCode ==0){ // if the scanCode starts with 224 or 0, get the scanCode again so it can read the full value
                    scanCode = getch();
                }

                switch(scanCode){ // this entire thing reads in all the numbers and stuff
                    case '1':
                    case 77:
                        //cout << "Option 1--> Select right";
                        selectRight(activeIndex, numUsed);
                        break;
                    case '2':
                    case 75:
                        //cout << "Option 2 --> Select Left";
                        selectLeft(activeIndex, numUsed);
                        break;
                    case '3':
                    case 72:
                        //cout << "Option 3 --> Move Right";
                        moveRight(list,activeIndex,numUsed);
                        break;
                    case '4':
                    case 80:
                        //cout <<"option 4 --> Move Left";
                        moveLeft(list,activeIndex,numUsed);
                        break;
                    case '5':
                    case 82:
                        cout << "option 5 --> Insert";
                        //insertElem();
                        break;
                    case '6':
                    case 83:
                        cout << "option 6 --> Delete";
                        deleteElem(list,activeIndex,numUsed);
                        break;
                    case '7':
                    case 60:
                        cout << "option 7 --> Sort";
                        //insertElem();
                        break;
                    case '8':
                    case 59:
                        cout << "option 8 --> exit!";
                        //insertElem()
                        break;
                }
            //showMainMenu();
            //showList(list,activeIndex,numUsed);
        }while(scanCode != 59); //this loop runs until f1 is hit.
    }
    return 0;
}

void showList(const int list[], int activeIndex, int numUsed){
    for(int i = 0; i < numUsed; i++){
        if(i==activeIndex){
            cout << "<" << list[i] << "> " ;
        }else{
            cout << list[i] << " ";
        }
    }
    cout << endl;
}

void showMainMenu(){
    cout <<endl<< "Select Right......\"1\" or \"Right Arrow\" key "<< endl <<
            "Select Left.......\"2\" or \"Left Arrow\" key "<<endl <<
            "Move Right........\"3\" or \"Up Arrow\" key " <<endl <<
            "Move Left.........\"4\" or \"Down Arrow\" key " <<endl <<
            "Insert............\"5\" or \"Insert\" key " <<endl <<
            "Delete............\"6\" or \"Delete\" key " <<endl <<
            "Sort..............\"7\" or \"F2\" key " <<endl <<
            "Exit..............\"8\" or \"F1\" key " << endl <<endl;
}

void moveLeft(int list[], int& activeIndex, int numUsed)
{
    int tempVal;
    if(!(isFirstSelected(activeIndex,numUsed))){
        tempVal = list[activeIndex -1];
        list[activeIndex-1] = list[activeIndex];
        activeIndex = activeIndex -1;
        list[activeIndex+1] = tempVal;
    }
}

void moveRight(int list[], int& activeIndex, int numUsed){
    int tempVal;
    if(!(isLastSelected(activeIndex,numUsed))){
        tempVal = list[activeIndex +1];
        list[activeIndex+1] = list[activeIndex];
        activeIndex = activeIndex +1;
        list[activeIndex-1] = tempVal;
        //activeIndex = activeIndex -1;
    }
}

void deleteElem(int list[], int& activeIndex, int& numUsed){
    int del = activeIndex;
    if(!(isArrayEmpty(numUsed))){
        for (int i = activeIndex; i < numUsed - 1; i++){
            list[i] = list[i + 1];
            if(isFirstSelected(activeIndex, numUsed)){
                activeIndex = 0;
            }
        }
        numUsed = numUsed -1;
        if(isFirstSelected(activeIndex, numUsed)){
            activeIndex = 0;
        }else{
            activeIndex = activeIndex -1;
        }
    }
}
//void shiftLeft(int list[],  )

void selectLeft(int& activeIndex, int numUsed){
    if(isFirstSelected(activeIndex,numUsed)){
        activeIndex = numUsed-1;
    }else{
        activeIndex = activeIndex -1;
    }
}

void selectRight(int& activeIndex, int numUsed){
    if(isLastSelected(activeIndex,numUsed)){
        activeIndex = 0;
    }else{
        activeIndex = activeIndex +1;
    }
}

bool isLastSelected(int activeIndex, int numUsed){
    if(activeIndex == (numUsed-1)){
        return true;
    }else{
        return false;
    }
}

bool isFirstSelected(int activeIndex, int numUsed){
    if(activeIndex == 0){
        return true;
    }else{
        return false;
    }
}

bool isArrayEmpty(int numUsed){
    if(numUsed ==0){
        return true;
    }else{
        return false;
    }
}

bool isArrayFull(int numUsed){
    if(numUsed >=10){
        return true;
    }else{
        return false;
    }
}