题解 | #三角形判断#

#include <stdio.h>

int yes_no(long int a,long int b,long int c);
int main() {
    long int a, b, c;
    int x;
    while (scanf("%ld %ld %ld", &a, &b, &c) != EOF) { // 注意 while 处理多个 case

      x=yes_no(a,b,c);
      if(x==1) 
      {
        if(a==b&&a==c)
        {
            printf("Equilateral triangle!\n");
        }
        else if((a==b&&a!=c)||(a==c&&a!=b)||(c==b&&a!=c))
        {
            printf("Isosceles triangle!\n");
        }
        else printf("Ordinary triangle!\n");
      } 
      else printf("Not a triangle!\n");

    }
    return 0;
}
int yes_no(long int a,long int b,long int c)
{
    int x=1,y=0;
    if(a<(b+c)&&b<(a+c)&&c<(a+b))
    {
        return x;
    }
    else return y;
}