Write C++ program to store first year percentage of students in array. Sort array of floating point numbers in ascending order using quick sort and display top five scores

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#include <iostream>
//Author : Vivek S. Sharma

//Copyright : Your copyright notice

using namespace std;

void quick_sort(int[],int,int);

int partition(int[],int,int);

void top_five(int[],int);

int main()

{

    int a[50],n,i;

    cout<<"Enter number of students : ";

    cin>>n;

    cout<<"\nEnter first year percentage :";

    for(i=0;i<n;i++)

        cin>>a[i];

    int ch;

    do{

      cout<<"\n\nEnter choice : \n1.Quick Sort \n2.Top five scores \n3.Exit";

      cin>>ch;

      switch(ch){

            case 1:quick_sort(a,0,n-1);

          cout<<"\nPercentage after sorting:";

          for(i=0;i<n;i++)

              cout<<a[i]<<" ";

          break;

            case 2: top_five(a,n);break;

      };

    }while(ch!=3);

    return 0;

}

void quick_sort(int a[],int l,int u)

{

    int j;

    if(l<u)

    {

        j=partition(a,l,u);

        quick_sort(a,l,j-1);

        quick_sort(a,j+1,u);

    }

}

int partition(int a[],int l,int u)

{

    int v,i,j,temp;

    v=a[l];

    i=l;

    j=u+1;

    do

    {

        do

            i++;

        while(a[i]<v&&i<=u);

        do

            j--;

        while(v<a[j]);

        if(i<j)

        {

            temp=a[i];

            a[i]=a[j];

            a[j]=temp;

        }

    }while(i<j);

    a[l]=a[j];

    a[j]=v;

    return(j);

}

void top_five(int a[],int n){

for(int i=n-1 ; i>=n-5 ; i--){

      cout<<"\n "<<a[i];

}

}
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**If some mistakes, plz let me know!-----Vivek S. Sharma