c语言编写程序：输入三角形的三条边,判断它们能否构成三角形,若能则指出何种三角形.

#include#includevoid main(){float a,b,c,s,area;printf("please input a,b,c\n");scanf("%f%f%f",&a,&b,&c);if(a+b>c&&b+c>a&&c+a>b){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);if(a==b&&a==c&&b==c)printf("equilateral tring\n");else if(a==b||a==c||b==c)printf("isosceles tring\n");else if((a*a+b*b==c*c)||(a*a+c*c==b*b)||(b*b+c*c==a*a))printf("right -angled tring\n");}else printf("not tring\n");}