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) {
        getchar();
        int e1 = a + b, e2 = a + c, e3 = b + c;
        if ( e1 > c && e2 > b && e3 > a) {
            if (a == b && a==c &&b==c) printf("Equilateral triangle!");
            else if (a == b || a == c || b == c) printf("Isosceles triangle!");
            else
                printf("Ordinary triangle!");
        } else {
            printf("Not a triangle!");
        }

    }
    return 0;
}