#include<cstdio> #include<cmath> int main(){ int a,b,c; scanf("%d%d%d",&a,&b,&c); double m=(a+b+c)/2.0; double sum=sqrt(m*(m-a)*(m-b)*(m-c)); printf("%.2f\n",sum); return 0; }
Double click to view unformatted code.