public class Fabs {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("請輸入數字x的值:");
//定義壹個變量x等於輸入的數值
int x = sc.nextInt();
if (x<0){
x=-x;
}else{
x=x;
}
System.out.print("x的絕對值為:"+x);