sorting descending order

#include <iostream>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int a , b=0;
    cout << "enter array size " ;
    cin>>a;
    int x[a+2];


    for(int i;i<a;i++){
        cin>>x[i];
    }
    cout<<" array is : ";
    for(int j;j<a;j++ ){
        cout<<x[j]<<" ";
    }
    cout<<endl;
    cout<<endl;

    //sort(x, x + a, greater<int>());

    for(int i=0;i<a;i++)
    {
        for(int j=i+1;j<a;j++)
        {
            if(x[i]<x[j])
            {
                b =x[i];
                x[i]=x[j];
                x[j]=b;

            }
        }
    }


    cout<<" In descending order : "<<endl;
    cout<<endl;
    cout<<" array is : ";
    for(int k;k<a;k++ ){
        cout<<x[k]<<" ";
    }

    return 0;
}