#include <stdio.h>void main(){ int a,b,c; printf("Please Input a,b,c:"); scanf("%d",&a); scanf("%d",&b); scanf("%d",&c); if(a+b<=c||a+c<=b||b+c<=a) /*判断是否能构成三角形*/ printf("No!\n"); else { printf("Yes!\n"); if(a==c||a==b||b==c) /*判断是否为等腰三角形*/ { printf("It can be an isoceles triangle!\n"); if(a==c && a==b) /*判断是否为等边三角形*/ printf("It also can be an equilateral triangle!\n"); else printf("But it can not be an equilateral triangle!\n"); } else { printf("It can't be an isoceles triangle!\n"); } } getch();}