关于《撸题集》里的♠♡♣♢

kuing

大家应该都留意到我的《kuing网络撸题集》里用于题目间隔的 $\spadesuit\ \heartsuit\ \clubsuit\ \diamondsuit$ 在每一节内是循环出现的，我的实现方法如下，代码并不深，应该很容易理解。

1. \documentclass{article}
2. \usepackage{amsthm}
4. \newtheorem{problem}{problem}[section]
6. \newcommand\tmtop[1]{\ifcase#1\or
7. \begin{center}$\spadesuit$\end{center}\or
8. \begin{center}$\heartsuit$\end{center}\or
9. \begin{center}$\clubsuit$\end{center}\or
10. \begin{center}$\diamondsuit$\end{center}\fi}
12. \newcounter{tmtopctr}
13. \newcommand\puttmtop{\tmtop{\value{tmtopctr}}%
14. \ifnum\value{tmtopctr}<4\relax
15. \addtocounter{tmtopctr}{1}%
16. \else\setcounter{tmtopctr}{1}\fi}
18. \newenvironment{prob}{%
19. \ifnum\value{problem}=0\relax
20. \setcounter{tmtopctr}{0}\fi
21. \puttmtop
22. \begin{problem}}{\end{problem}}
24. \begin{document}
26. \section{test1}
28. \begin{prob}
29. aaa
30. \end{prob}
32. \begin{prob}
33. bbb
34. \end{prob}
36. \begin{prob}
37. ccc
38. \end{prob}
40. \begin{prob}
41. ddd
42. \end{prob}
44. \begin{prob}
45. eee
46. \end{prob}
48. \begin{prob}
49. fff
50. \end{prob}
52. \begin{prob}
53. ggg
54. \end{prob}
56. \begin{prob}
57. hhh
58. \end{prob}
60. \begin{prob}
61. iii
62. \end{prob}
64. \begin{prob}
65. jjj
66. \end{prob}
68. \section{test2}
70. \begin{prob}
71. kkk
72. \end{prob}
74. \begin{prob}
75. lll
76. \end{prob}
78. \begin{prob}
79. mmm
80. \end{prob}
82. \end{document}

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