task8.c

include<stdio.h>

include<math.h>

int main()
{
double s, a, b, c, area;
while (scanf_s("%lf%lf%lf", &a, &b, &c) != EOF)
{
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("a = %.3f b = %.3f c = %.3f s = %.3f, area = %.3f", a, b, c, s, area);
printf("\n");
}

return 0;

}