View Compilation Error

0_0_37013496_292\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_37013496_292\Main.java:3: 错误: 需要class, interface或enum
		while(sc.hasNext()) {
		^
0_0_37013496_292\Main.java:5: 错误: 需要class, interface或enum
			double y1 = sc.nextDouble();
			^
0_0_37013496_292\Main.java:6: 错误: 需要class, interface或enum
			double x2 = sc.nextDouble();
			^
0_0_37013496_292\Main.java:7: 错误: 需要class, interface或enum
			double y2 = sc.nextDouble();
			^
0_0_37013496_292\Main.java:8: 错误: 需要class, interface或enum
			double ans =Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
			^
0_0_37013496_292\Main.java:9: 错误: 需要class, interface或enum
			System.out.printf("%.2f",ans);
			^
0_0_37013496_292\Main.java:10: 错误: 需要class, interface或enum
			System.out.println();
			^
0_0_37013496_292\Main.java:12: 错误: 需要class, interface或enum
		}
		^
9 个错误