View Compilation Error

0_0_30576549_11272\Main.java:10: 错误: 需要';'
                int b = (a-1)/2
                               ^
0_0_30576549_11272\Main.java:15: 错误: 需要')'
                long r = (long)Math.pow(2, (int)((a/2));
                                                       ^
2 个错误