#include <stdio.h>//本题目卡住的点：1.逻辑问题 2.对if-else if-else结构的运行理解，导致了逻辑混乱//注意：程序会组个判断，只要写出每一个情况，只要符合了就会执行，同时注意换行输出int main()
{int arr[3];int temp;for (int i = 0; i < 3; i++){scanf("%d", &arr[i]);}for (int i = 0; i < 2; i++){for (int j = 0; j < 2 - i; j++){if (arr[j] > arr[j + 1]){temp = arr[j];arr[j] = arr[j + 1];arr[j + 1] = temp;}}}int a, b, c;a = arr[0];b = arr[1];c = arr[2];if (a + b <= c){printf("Not triangle\n");}else{if (a * a + b * b == c * c){printf("Right triangle\n");}else if (a * a + b * b > c * c){printf("Acute triangle\n");}else if (a * a + b * b < c * c){printf("Obtuse triangle\n");}//理解这里单独使用if的原因：在else if中如果有条件符合了就不会继续往下执行if (a == b || b == c || a == c) //排序了,a==c可以不用写，但是等边也是特殊的等腰三角形，符合情况{printf("Isosceles triangle\n");}if (a == b && b == c){printf("Equilateral triangle\n");}}return 0;
}
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