foo.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
foo.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'distance_to_opposite_bank'
    3 | distance_to_opposite_bank = float(input("请输入对岸的距离（米）"))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:6:27: error: stray '#' in program
    6 |     initial_distance = 2  # 第1下游的距离
      |                           ^
foo.c:7:28: error: stray '#' in program
    7 |     reduction_rate = 0.96  # 每一步的距离减少率
      |                            ^

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