Simpson 1/3rd rule in C

#include<stdio.h>
#include<conio.h>


float f(float x)
{
     return(1/(1+x*x));;
}
void main()
{
    int i,n;
    float x0,xn,h,y[2000],so,se,ans,x[2000];
    printf("\n\n\t\t\t----Crazy Coders----\n\n");
    printf("\n Enter values of x0(lower limit): ");
    scanf("%f",&x0);
    printf("\n Enter values of xn(upper limit): ");
    scanf("%f",&xn);
    printf("\n Enter values of h(intervals): ");
    scanf("%f",&h);

    n=(xn-x0)/h;
    if(n%2==1)
    {
        n=n+1;
    }
    h=(xn-x0)/n;
    printf("\n After calculating the value of n and h are :  \n ");
    printf("\t\tn = %d ",n);
    printf("\t\th = %d ",h);
    printf("\n Y values: \n");
    for(i=0; i<=n; i++)
    {
        x[i]=x0+i*h;
        y[i]=f(x[i]);
        printf("\n %f\n",y[i]);
    }
    so=0;
    se=0;
    for(i=1; i<n; i++)
    {
        if(i%2==1)
        {
            so=so+y[i];
        }
        else
        {
            se=se+y[i];
        }

    }
    ans=h/3*(y[0]+y[n]+4*so+2*se);
    printf("\n The result is %f",ans);

    getch();
}

OUTPUT :-

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