编辑代码

#include <stdio.h>
using namespace std;
int main()
float area(float x,float y,float z)
{
    float,c,s;
    c=(x+y+z)/2;
    s=sqrt(c*(c-x)*(c-y)*(c-z));
    return s;

}
int main() 
{float a,b,c,d,e,f,g,s;
cin>>a>>b>>c>>d>>e>>f>>g;
s=area(a,b,c)+area(c,d,e)+area(e,f,g);
cout<<s<<endl;
system("pause");return 0;
}