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#include <iostream>
#include <cmath>
using namespace std;
 
class Trig
{
public:
     float s(float x,float y,float z);
     Trig(float x,float y,float z);
    friend float add(Trig &s1,Trig &s2);
private:
    float a,b,c;
};
float Trig::s(float x,float y,float z){
float l;
l=0.5*(x+y+z);
return sqrt(l*(l-x)*(l-y)*(l-z));
}
Trig::Trig(float x,float y,float z){
a=x;
b=y;
c=z;
}
float add(Trig &t1,Trig &t2)
{
  float x1=t1.s(x,y,z);
  float x2=t2.s(x,y,z);
  return x1+x2;
}
int main()
{
float x1,y1,z1;
float x2,y2,z2;
cout<<"输入第一个三角形的三边长"<<endl;
cin>>x1>>y1>>z1;
cout<<"输入第二个三角形的三边长"<<endl;
cin>>x2>>y2>>z2;
Trig triangle1(x1,y1,z1);
Trig triangle2(x2,y2,z2);
cout<<triangle1.s(x1,y1,z1)<<"  "<<triangle2.s(x2,y2,z2)<<endl;
return 0;
}

prog.cpp: In function 'float add(Trig&, Trig&)':
prog.cpp:26:17: error: 'x' was not declared in this scope
   float x1=t1.s(x,y,z);
                 ^
prog.cpp:26:19: error: 'y' was not declared in this scope
   float x1=t1.s(x,y,z);
                   ^
prog.cpp:26:21: error: 'z' was not declared in this scope
   float x1=t1.s(x,y,z);
                     ^

Standard output is empty