c programming language

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<iomanip.h>
#include<stdlib.h>
#include<dos.h>
#include<io.h>

void main()
{
FILE *fp;
int n;
float med,j;
clrscr();
cout<<"HOW MANY NOS.? ";
cin>>n;
cout<<"ENTER SOME RANDOM NOS.";
fp = fopen("random.txt", "w+");

/* write some data to the file */
for(int i=1;i<=n;i++)
{
cin>>j;
fprintf(fp,"%f\n",j);
}
/* close the file */
fclose(fp);
fp=fopen("random.txt", "r+");
//fseek(fp, 0, SEEK_SET);
i=0;
float mean=0;
float arr[20];
while(i<n)
{
fscanf(fp,"\n%f",&arr[i]);
mean=mean+arr[i];
i++;
}
cout<<"store";
for(i=0;i<n;i++)

{Bin= (NumBins * (X - Xmin)) / (Xmax - Xmin);
if (Bin < 0) Bin= 0; else if (Bin >= NumBins) Bin= NumBins - 1;
cout<<"\nbin is :"<<ele(arr[i]/n);

}

//***************************MEDIAN*****************************
int temp;

for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(arr[j]<arr[i])
{
temp=arr[i];
arr[i]=arr[j];
arr[j]=temp;
}
}
}
int div;

cout<<"mean is : "<<mean/n;
if(n%2!=0)
{
med=(n+1)/2;
cout<<"\nmedian is :"<<arr[med-1];
}
else
{
div=n/2;
med=(arr[div]+arr[div-1])/2;
cout<<"\nmedian is :"<<med;
}

//********************Eucledian Distance***********************************

float eucl[20];
fseek(fp, 0, SEEK_SET);
for(int p=0;p<n;p++)
fscanf(fp,"\n%f",&eucl[p]);
cout<<"\n";
for(int f=0;f<n;f++)
for(int k=0;k<n;k++)
{
  temp=eucl[f]-eucl[k];
  cout<<"\nEucledian Distance of "<<eucl[f]<<" with respect to "<<eucl[k]<<" is "<<temp;
}
fclose(fp);
getch();
}