#include <stdio.h>
#include <math.h>
int main()
{
double a,b,c,s,area;
scanf("%lf,%lf,%lf",&a,&b,&c);
s=1.0/2*(a+b+c);
area=sqrt(s*(s-a)*(s-b)*(s-c));
printf("a=%7.2g,b=%7.2g,c=%7.2g,s=%7.2g\n",a,b,c,s);
printf("area=%7.2g\n",area);
return 0;
}
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