Java 斜率计算

输入两个点的坐标，即p1 = (x1, y1)和p2=(x2, y2)，求过这两个点的直线的斜率。如果斜率为无穷大输出“INF”。
样例输入
1 2
2 4
样例输出
2
样例输入
1 2
1 4
样例输出
INF
样例输入
1 2
3 2
样例输出
0

import java.util.Scanner;
public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x1 = sc.nextInt();
        int y1 = sc.nextInt();
        int x2 = sc.nextInt();
        int y2 = sc.nextInt();
        if (x1 == x2){
            System.out.println("INF");
            return;
        }
        if (y1 == y2){
            System.out.println(0);
            return;
        }
        int v = (y2-y1)/(x2-x1);
        System.out.println(v);
     }
}