#include<iostream>using namespace std;int main(){    int a,b,c;    cout<<"please input a,b and c : "<<endl;    cin>>a>>b>>c;    if((a+b<c)||(a+c<b)||(b+c<a)||(a-b>=c)||(a-c>=b)||(b-c>=a)||(b-a>=c)||(c-a>=b)||(c-b>=a))//注意不要忘了有等于的情况    {        cout<<"can not be a triangle."<<endl;    }else if((a*a==b*b+c*c)||(b*b==a*a+c*c)||(c*c==a*a+b*b))    {        cout<<"it is a right triangle(直角三角形)."<<endl;    }else if(a==b&&b==c)//注意不能写成a==b==c    {        cout<<"it is an equilateral triangle(等边三角形)."<<endl;    }    return 0;}