View Compilation Error

0_0_37017272_29436\Main.java:3: 错误: 需要class, interface或enum
public Main {
       ^
0_0_37017272_29436\Main.java:4: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_37017272_29436\Main.java:6: 错误: 需要class, interface或enum
	while (scanner.hasNext()) {
	^
0_0_37017272_29436\Main.java:8: 错误: 需要class, interface或enum
		if (a>=90&&a<=100) {
		^
0_0_37017272_29436\Main.java:10: 错误: 需要class, interface或enum
		}else	if (a<90&&a>=80) {
		^
0_0_37017272_29436\Main.java:12: 错误: 需要class, interface或enum
		}		else if (a<80&&a>=70) {
		^
0_0_37017272_29436\Main.java:15: 错误: 需要class, interface或enum
		}else if (a<70&&a>=60) {
		^
0_0_37017272_29436\Main.java:18: 错误: 需要class, interface或enum
		}else if (a<60&&a>=0) {
		^
0_0_37017272_29436\Main.java:20: 错误: 需要class, interface或enum
		}else {
		^
0_0_37017272_29436\Main.java:22: 错误: 需要class, interface或enum
			}
			^
10 个错误