题解 | #三角形判断#

#include <stdio.h>
int main()
{
float a,b,c;
while(~scanf("%f %f %f",&a,&b,&c))
{
    getchar();
    if(a+b<=c||a+c<=b||b+c<=a)
        printf("Not a triangle!\n");
    else if(a==b&&b==c)
        printf("Equilateral triangle!\n");
    else if(a==b||a==c||b==c)
        printf("Isosceles triangle!\n");
    else
        printf("Ordinary triangle!\n");
}
return 0;
}