foo.c:1:1: error: unknown type name 'impot'
    1 | impot math
      | ^~~~~
foo.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a'
    2 | a=float(input("请输入三角形边长a"))
      | ^
foo.c:7:7: warning: multi-character character constant [-Wmultichar]
    7 | ptint('%.2f'%s)
      |       ^~~~~~

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