题解 | #三角形判断#

#include <stdio.h>

int main()
{
    float a = 0.0f;
    float b = 0.0f;
    float c = 0.0f;
    while (scanf("%f %f %f", &a, &b, &c) != EOF)
    {
        if ((a + b > c) && (a + c > b) && (b + c > a))//判断是不是三角形
        {
            if ((a == b) && (b == c))//判断是不是等边三角形
            {
                printf("Equilateral triangle!\n");
            }
            else if ((a == b) || (b == c) || (a == c))//判断是不是等腰三角形
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            printf("Not a triangle!\n");
        }
    }
    return 0;
}