Bezier Curve

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

void beizer(int x[],int y[]){
    double u;
    int i;
    for(u=0.0;u<1.0;u+=0.0001){
    double tx = pow((1-u), 3)*x[0] + 3*u*pow((1-u), 2)*x[1] + 3*pow(u, 3)*(1-u)*x[2]+pow(u, 3)*x[3];
    double ty = pow((1-u), 3)*y[0] + 3*u*pow((1-u), 2)*y[1] + 3*pow(u, 3)*(1-u)*y[2]+pow(u, 3)*y[3];
    putpixel(tx,ty,12);
    }
}

void startgraphics(){
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"");
    cleardevice();
}

void main(){
    int i, x[4], y[4];
    startgraphics();

    for(i=0; i<4; i++){
    printf("Enter coordinates of point %d:-\n",i+1);
    scanf("%d%d", &x[i], &y[i]);
    }
    beizer(x, y);
    getch();
    closegraph();
}