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View Compilation Error

0_0_34387957_19122\Main.java:1: 错误: 需要class, interface或enum
Scanner in=new Scanner(System.in);
^
0_0_34387957_19122\Main.java:2: 错误: 需要class, interface或enum
       while(in.hasNext()) {
       ^
0_0_34387957_19122\Main.java:4: 错误: 需要class, interface或enum
           if (a <= 100) {
           ^
0_0_34387957_19122\Main.java:7: 错误: 需要class, interface或enum
               } else if (a < 90 && a >= 80) {
               ^
0_0_34387957_19122\Main.java:9: 错误: 需要class, interface或enum
               } else if (a < 80 && a >= 70) {
               ^
0_0_34387957_19122\Main.java:11: 错误: 需要class, interface或enum
               } else if (a < 70 && a >= 60) {
               ^
0_0_34387957_19122\Main.java:13: 错误: 需要class, interface或enum
               } else {
               ^
0_0_34387957_19122\Main.java:15: 错误: 需要class, interface或enum
               }
               ^
0_0_34387957_19122\Main.java:19: 错误: 需要class, interface或enum
           }
           ^
9 个错误


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