题解 | #三角形判断#

#include <stdio.h>

int main() {
    float a,b,c;
    while(scanf("%f %f %f",&a,&b,&c)!=EOF){
    if((a+b>c)&&(a+c>b)&&(b+c>a))
    {
        if(a==b&&b==c)
        {
            printf("Equilateral triangle!\n");
        }
        if((a==b&&b!=c)||(a==c&&a!=b)||(b==c&&b!=a))
        {
            printf("Isosceles triangle!\n");
        }
        if((a!=b)&&(b!=c)&&(a!=c)) {
        printf("Ordinary triangle!\n");
        }
    }
    if((a+c<=b)||(a+b<=c)||(b+c<=a)){
    printf("Not a triangle!\n");}
    
    }
    return 0;
}