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 + c > b && a + b > c && c + b > a) 
        {
            if (a == b && b == c) 
            {
                printf("Equilateral triangle!\n");
            } 
            else if (a == c  || b == c   || a == b ) 
            {
                printf("Isosceles triangle!\n");
            } 
            else 
            {
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            printf("Not a triangle!\n");
        }

    }

    return 0;
}