Exception erro when use while loop and sc.close() at same time. But can be run, if delete one of them

import java.util.*;

public class Hw4_Chenglin_Nie {

public static void main(String[] args){

Scanner sc = new Scanner(System.in);

while(true){

int[] arrNum = new int[5];

for(int i = 0; i

System.out.print("Enter a integer "+(i+1)+":");

arrNum[i] = sc.nextInt();

}

int min = arrNum[0],max = arrNum[0],diff = 0;

for(int tempNum: arrNum){

min = Math.min(min,tempNum);

max = Math.max(max,tempNum);

}

diff = max - min;

System.out.printf("%nMax number: %1$d %nMin number : %2$d %nDifference : %3$d %n%n",

max,min,diff);

}

sc.close();

}

}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: Unreachable code

public static void main(String[] args) { Scanner sc = new Scanner(System.in); while(true){ int[] arrNum = new int[5]; for(int i = 0; i