array menu

[cash]

I need help with options 6 and 4 in the menu.

This is the menu :

0. Create array: Asks user how many numbers to fill (the length of the partially filled array), with
random numbers 0-99. First fill all 100 elements with zeroes then insert as many random
numbers as specified by the user. Validate the user entered number (1-99).
1. Calculates and prints the highest value, lowest, sum, and average of the partially filled array.
2. Add a number to the end: asks user to enter a number and adds it to the end of the partially
filled array.
3. Find index of a number: Displays the index of a number if it exists otherwise a message
saying that the number is not found.
4. Insert number at index: Ask the user to enter a number and the index to insert it in. Display
error message if the specified index is outside the current partially filled array size.
5. Remove number: Ask the user to enter a number, remove it if it exists otherwise display a
message to indicate that it does not exist.
6 Remove number at index: Ask the user to enter the index. Remove the number at the
specified index or display error message if the specified index is outside the current partially
filled array size.

  #include <iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main()
{
    const int LENGTH =100;
    int array[LENGTH];
    srand(((unsigned)time(0)));
    
    
    int cnt = 0;
    cout << "Enter the length of the array: " ;
    cin >> cnt ;
    if( cnt > LENGTH )
        cnt = LENGTH ;
    
    for( int i = 0; i < cnt ; ++i )
        array[i] = 1 + rand() % 100;
    
    for( int i = 0; i < cnt ; ++i )
        cout << array[i] << ' ' ;
    cout << '\n' ;
    
    int input;
    cout << "Enter your menu choice" << endl;
    cout << "1. Find high, low, sum average" << endl;
    cout << "2. Add a number to the end" << endl;
    cout << "3. Find the index of a number" << endl;
    cout << "4. Insert number at index" << endl;
    cout << "5. Remove number" << endl;
    cout << "6. Remove number at index" << endl;
    cout << "7. Quit" << endl;
    cin >> input;
    
    if (input == 1) {
        
        int sum = 0;
        int average = 0;
        int high = array[0];
        int low = array[0];
        
        for (int dx = 0; dx < cnt; dx++)
        {
            sum += array[dx];
            if(array[dx] > high) high = array[dx];
            if(array[dx] < low)  low = array[dx];
        }
        average = sum/ cnt;
        cout << "The highest number is " <<high<<endl << "The lowest number is " << low<< endl<< "The average is " << average << endl;
    }
    else if (input == 2)
    {
        int number;
        cout << "Enter a number to add" << endl;
        cin >> number;
        for( int i = 0; i < cnt ; ++i )
            cout << array[i] << ' ' ;
        cout << number;
        
    }
    
    else if ( input == 3){
        int TheNum =0;
        int i =0;
        cout << "Number to search for: ";
        cin >> TheNum;
        
        for(i = 0; i < cnt; i++)
        {
            if(array[i] == TheNum){
                cout <<  TheNum << " is at index " << i << endl;
                
                for( int i = 0; i < cnt ; ++i )
                    cout << array[i] << ' ' ;
                cout << '\n' ;
            }
            
        } if(TheNum!=cnt){
            cout << TheNum << " does not exist" << endl;} }
    
    else if (input == 4){
        int number =0;
        int index =0;
        cout << "Enter a number to insert\n" ;
        cin >> number;
        cout << "Enter the index to insert\n";
        cin >> index;
        for( int i = 0; i < cnt ; ++i )
            cout << array[i] << ' ' ;
        cout << number;
    }
    else if (input == 5){
        int del = 0;
        int count = 0;
        cout << "Enter a number to remove" << endl;
        cin >> del;
        for(int i=0; i<cnt; i++)
        {
            if(array[i]==del)
            {
                for(int j=i; j<(cnt-1); j++)
                {
                    array[j]=array[j+1];
                }
                count++;
                break;
            }
        }
        if(count==0)
        {
            cout<<"Element not found..!!";
        }
        else
        {
            for(int i=0; i<(cnt-1); i++)
            {
                cout<<array[i]<<" ";
            }
        }
        
      
        }
    
    else if (input == 6){
        int index=0;
        int count=0;
        cout << "Enter the index to remove:" << endl;
        cin >>index;
        
        for(int i=0; i<cnt; i++)
        {
            if(index==i)
            {
                for(int i=index+1; i<cnt; i++)
                {
                    array[i-1] = array[i];
                }}}
        
        if(count==0)
        {
            cout<<"Element not found..!!";
        }
        else
        {
            for(int i=0; i<(cnt-1); i++)
            {
                cout<<array[i]<<" ";
            }
        }
    }
        

    else if (input == 7){
        cout << " Good By " << endl;
        return 0;
        
    }
    }