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class Lamp
{
private:
    float Pn, Un, U;
public:
    float RawP() { return (U * Pn / Un); }
    static float operator/(Lamp a, Lamp b);
};
 
float operator/(Lamp a, Lamp b)  
{   
    float tmp;   
    tmp = a.RawP() / b.RawP();
    return tmp;   
} 
 
int main()
{
float s;
s = Arr[j] / Arr[k];
}

prog.cpp:7:42: error: ‘static float Lamp::operator/(Lamp, Lamp)’ must be either a non-static member function or a non-member function
     static float operator/(Lamp a, Lamp b);
                                          ^
prog.cpp: In function ‘int main()’:
prog.cpp:20:5: error: ‘Arr’ was not declared in this scope
 s = Arr[j] / Arr[k];
     ^~~
prog.cpp:20:9: error: ‘j’ was not declared in this scope
 s = Arr[j] / Arr[k];
         ^
prog.cpp:20:18: error: ‘k’ was not declared in this scope
 s = Arr[j] / Arr[k];
                  ^

Standard output is empty