题解 | #三角形判断#

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	while (scanf("%d %d %d", &a, &b, &c) != EOF) 
	{ 
		if (a + b > c && a + c > b && b + c > a && a - b < c && a - c < b && b - c < a)
		{
			if (a == b && b == c)
			{
				printf("Equilateral triangle!\n");
			}
			else if (a == b || a == c || b == c)
			{
				printf("Isosceles triangle!\n");
			}
			else
			{
				printf("Ordinary triangle!\n");
			}
		}
		else
		{
			printf("Not a triangle!\n");
		}
	}
	return 0;
}