题解 | #三角形判断#

#include <stdio.h>

int main() {
    int a, b, c = 0;
    while (scanf("%d %d %d", &a, &b, &c) != EOF) 
    {
        {//把a,b,c的按从大到小排序
            if(a<b)
            {
            int tmp = a;
            a = b;
            b = tmp;
            }
            if(a<c)
            {
            int tmp = a;
            a = c;
            c = tmp;
            }
            if(b<c)
            {
            int tmp = b;
            b = c;
            c = tmp;
            }
           // printf("%d %d %d",a,b,c);
        }
       if(b+c>a)
       {
        if (a == b && b == c && c == a) 
        {
            printf("Equilateral triangle!\n");
        } 
        else if (a == b && b!= c || a !=b && b == c || a == c && c != b) 
        {
            printf("Isosceles triangle!\n");
        }
        else 
        {
        printf("Ordinary triangle!\n");
        }
       }
       if(b+c<=a)
       {
        printf("Not a triangle!\n");
       }
    }
    return 0;
}