题解 | #三角形判断#

#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;

    //多组输入
    while (~scanf(" %d%d%d", &a, &b, &c))
    {
        if ((a + b > c) && (a + c > b) && (b + c > a))
        {
            //是三角形
            if ((a == b) && (b == c))
            {
                //等边三角形
                printf("Equilateral triangle!\n");
            }
            else if (((a == b) && (b != c)) || ((b == c) && (c != a)) || ((a == c) && (c != b)))
            {
                //等腰三角形
                printf("Isosceles triangle!\n");
            }
            else
            {
                //其余三角形
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            //不是三角形
            printf("Not a triangle!\n");
        }
    }

    return 0;
}