variable min might not have been initialized return min; ^ 1 error. how do you initialized min?

package com.codegym.task.task02.task0217; /* Minimum of four numbers */ public class Solution { public static int min(int a, int b, int c, int d) { //write your code here int min; if (a <= b & a <= c & a <= d) min = a; else if (b <= a & b <= c & b <= d) min = b; else if (c <= a & c <= b & c <= d) min = c; else if ( d <= a & d <= c & d <= b) min = d; return min; } public static int min(int a, int b) { //write your code here if (a < b) return a; else return b; } public static void main(String[] args) throws Exception { System.out.println(min(-20, -10)); System.out.println(min(-20, -10, -30, -40)); System.out.println(min(-20, -10, -30, 40)); System.out.println(min(-40, -10, -30, 40)); } }