View Compilation Error

0_0_37077909_12776\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_37077909_12776\Main.java:4: 错误: 需要class, interface或enum
	while(sc.hasNext()) {
	^
0_0_37077909_12776\Main.java:6: 错误: 需要class, interface或enum
		double y1 =sc.nextDouble();
		^
0_0_37077909_12776\Main.java:7: 错误: 需要class, interface或enum
		double x2 =sc.nextDouble();
		^
0_0_37077909_12776\Main.java:8: 错误: 需要class, interface或enum
		double y2 =sc.nextDouble();
		^
0_0_37077909_12776\Main.java:9: 错误: 需要class, interface或enum
		double ans =Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
		^
0_0_37077909_12776\Main.java:10: 错误: 需要class, interface或enum
		System.out.printf("%.2f",ans);
		^
0_0_37077909_12776\Main.java:11: 错误: 需要class, interface或enum
		System.out.println();
		^
8 个错误