#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


