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View Compilation Error

0_0_39742465_5388\Main.java:52: 错误: 非法的表达式开始
        return switch (op) {
               ^
0_0_39742465_5388\Main.java:52: 错误: 不是语句
        return switch (op) {
                      ^
0_0_39742465_5388\Main.java:52: 错误: 需要';'
        return switch (op) {
                          ^
0_0_39742465_5388\Main.java:53: 错误: 孤立的case
            case '+' -> a + b;
            ^
0_0_39742465_5388\Main.java:53: 错误: 需要:
            case '+' -> a + b;
                    ^
0_0_39742465_5388\Main.java:53: 错误: 非法的表达式开始
            case '+' -> a + b;
                     ^
0_0_39742465_5388\Main.java:53: 错误: 需要';'
            case '+' -> a + b;
                         ^
0_0_39742465_5388\Main.java:53: 错误: 不是语句
            case '+' -> a + b;
                            ^
0_0_39742465_5388\Main.java:54: 错误: 需要:
            case '-' -> a - b;
                    ^
0_0_39742465_5388\Main.java:54: 错误: 非法的表达式开始
            case '-' -> a - b;
                     ^
0_0_39742465_5388\Main.java:54: 错误: 需要';'
            case '-' -> a - b;
                         ^
0_0_39742465_5388\Main.java:54: 错误: 不是语句
            case '-' -> a - b;
                            ^
0_0_39742465_5388\Main.java:55: 错误: 需要:
            case '*' -> a * b;
                    ^
0_0_39742465_5388\Main.java:55: 错误: 非法的表达式开始
            case '*' -> a * b;
                     ^
0_0_39742465_5388\Main.java:55: 错误: 需要';'
            case '*' -> a * b;
                         ^
0_0_39742465_5388\Main.java:55: 错误: 不是语句
            case '*' -> a * b;
                            ^
0_0_39742465_5388\Main.java:56: 错误: 需要:
            case '/' -> a / b;
                    ^
0_0_39742465_5388\Main.java:56: 错误: 非法的表达式开始
            case '/' -> a / b;
                     ^
0_0_39742465_5388\Main.java:56: 错误: 需要';'
            case '/' -> a / b;
                         ^
0_0_39742465_5388\Main.java:56: 错误: 不是语句
            case '/' -> a / b;
                            ^
0_0_39742465_5388\Main.java:57: 错误: 需要:
            default -> 0;
                   ^
0_0_39742465_5388\Main.java:57: 错误: 非法的表达式开始
            default -> 0;
                    ^
0_0_39742465_5388\Main.java:57: 错误: 需要';'
            default -> 0;
                      ^
23 个错误


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