题目内容

给定程序MODll．C中函数fun的功能是：根据输入的三个边长(整型值)，判断能否构成三角形：构成的是等边三角形，还是等腰三角形。若能构成等边三角形函数返回3，若能构成等腰三角形函数返回2，若能构成一般三角形函数返回1，若不能构成三角形函数返回0。
请改正函数fun中指定部位的错误，使它能得出正确的结果。
注意：不要改动main函数，不得增行或删行，也不得更改程序的结构!

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To avoid the various foolish opinions to which mankind is prone, no superhuman genius is required. If the matter is one that can be settled by observation, make the observation yourself. Many matters, however, are less easily brought to the test of experience. If you have passionate convictions on many such matters, there are ways in which you can make yourself aware of your own bias.
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