View Compilation Error

0_0_16642382_2944\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[]args)
              ^
0_0_16642382_2944\Main.java:4: 错误: 需要class, interface或enum
		int a,b;
		^
0_0_16642382_2944\Main.java:5: 错误: 需要class, interface或enum
		a = in.nextInt();
		^
0_0_16642382_2944\Main.java:6: 错误: 需要class, interface或enum
		do
		^
0_0_16642382_2944\Main.java:9: 错误: 需要class, interface或enum
			if(b<=100&&b>=90)
			^
0_0_16642382_2944\Main.java:11: 错误: 需要class, interface或enum
			if(b<=89&&b>=80)
			^
0_0_16642382_2944\Main.java:13: 错误: 需要class, interface或enum
			if(b<=79&&b>=70)
			^
0_0_16642382_2944\Main.java:15: 错误: 需要class, interface或enum
			if(b<=69&&b>=60)
			^
0_0_16642382_2944\Main.java:17: 错误: 需要class, interface或enum
			if(b<=59&&b>=0)
			^
0_0_16642382_2944\Main.java:19: 错误: 需要class, interface或enum
			if(b<0||b>100)
			^
0_0_16642382_2944\Main.java:21: 错误: 需要class, interface或enum
		}while(a>0);
		^
0_0_16642382_2944\Main.java:22: 错误: 需要class, interface或enum
	}
	^
12 个错误