#include <stdio.h>#include <stdlib.h>#include <math.h>int main(){ double area,perimeter,s,a,b,c; scanf("%lf %lf %lf",&a,&b,&c); if ((a+b>c)||(a+c>b)||(b+c>a)){ s=(a+b+c)/2; perimeter=a+b+c; area=sqrt(s*(s-a)*(s-b)*(s-c)); printf("area=%.2f；perimeter=%.2f\n",area,perimeter); } else{ printf("These sides do not correspond to a valid triangle\n"); }return 0;}大佬看看这个哪错了