блок схема

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как построить блок схему к этому?
int main()
{
double x1,y1,x2,y2,x3,y3;
double s, p, pp;
double storona1,storona2,storona3;
cout << " x1= ";
cin>> x1;
cout << " y1= ";
cin>> y1;
cout << " x2= ";
cin>> x2;
cout << " y2= ";
cin>> y2;
cout << " x3= ";
cin>> x3;
cout << " y3= ";
cin>> y3;
storona1=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
storona2=sqrt((x3-x2)*(x3-x2)+(y3-y2)*(y3-y2));
storona3=sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));
p=storona1+storona2+storona3;
pp=p/2;
s=sqrt(pp*(pp-storona1)*(pp-storona2)*(pp-storona3));
cout << " S= " << s << " P= "<< p << endl;
getch();
return 0;
}

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