C C++ CODE : Numerical integration for tabular data

Working C C++  Source code program for numerical integration - trapeziode and simpsons 1/3 method

/************************ INTEGRATION FOR TABULAR DATA *****************/
#include<iostream.h>
#include<conio.h>
int main()
{
    int n,i;
    float x[10],f[10],h,sum=0,a;
    clrscr();
    cout<<"No of datas ? ";cin>>n;
    cout<<"Enter datas : ";
    for(i=0;i<n;i++)
        cin>>x[i]>>f[i];
        
    for(i=0;i<n;i++)
    {
        if(i==0||i==n-1)
            sum+=f[i];
        else
            sum+=2*f[i];
    }
    h=x[1]-x[0];
    cout<<"The value using trapezoide: "<<h*sum/2;
    a=x[0];
    sum=0;
    while((a-h)<x[n])
    {
        sum+=(f[a]+4*f[a+h]+f[a+2*h]);
        a+=2*h;
    }
    cout<<"\nThe value using simpsons 1/3 is : "<<h*sum/3;
    getch();
    return 0;
}