题解 | #三角形判断#

#include <stdio.h>

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