STRUCTURE OF ARRAY

#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;
typedef struct Pipe
{
    double diameter;
    double lenght;
    double thickness;
    char *material;
} PIPE;
void display_pipe(PIPE pipe0);
void create_pipe(PIPE *pipe0);
double TotalMassPipes(PIPE pipe[],int ArraySize);
double TotalMassPipesCu(PIPE pipe[], int ArraySize, char *material);
double LenghtPipeline(PIPE pipe[], int ArraySize, char*material);
int main()
{const int SIZE = 1000;
  PIPE pipe[SIZE];

  for(int i=0; i<SIZE; i++){
    create_pipe(&pipe[i]);
    display_pipe(pipe[i]);


  }

 cout<< " total mass of pipe :" << TotalMassPipes(pipe, SIZE) << endl;
  cout<< " total mass of Cu :" << TotalMassPipesCu(pipe, SIZE, "Cu") << endl;
  cout<< " Longest lenght of Cu :" << LenghtPipeline(pipe, SIZE, "Cu") << endl;







    return 0;
}
double pipe_volume(PIPE pipe0){
double vol, s1, s2;
s1 = M_PI* pow(pipe0.diameter,2)/4;
s2 = M_PI*pow(pipe0.diameter-2*pipe0.thickness,2)/4;
return vol = (s1-s2)*pipe0.lenght/1000000;
}
double pipe_mass(PIPE pipe0){
    double mass,density=1000;
    if(pipe0.material=="steel") density=7800;
    if(pipe0.material=="cast iron") density= 7800;
    if(pipe0.material=="Al") density= 2700;
    if(pipe0.material=="PVC") density= 3200;
    if(pipe0.material=="Cu") density= 8900;
    return mass = density*pipe_volume(pipe0);
}
void create_pipe(PIPE *pipe0){
 pipe0 ->lenght = (rand()%61+10)/10.+1;
 pipe0 ->diameter = (rand()%5+1)*10;
 pipe0 ->thickness = pipe0->diameter*0.1;
int a = rand()%5 + 1;
if (a==1) pipe0 ->material = "steel";
 if (a==2) pipe0 ->material = "Cu";
 if (a==3) pipe0 ->material = "cast iron";
  if (a==4) pipe0 ->material = "PVC";
   if (a==5) pipe0 ->material = "Al";
}


void display_pipe(PIPE pipe0)
{

    cout <<"PIPE parameters" << endl;
    cout << " diameter " <<pipe0.diameter<< endl;
    cout << " lenght " <<pipe0.lenght<< endl;
    cout << " thickness " <<pipe0.thickness<< endl;
    cout << " material " <<pipe0.material<< endl << endl;
    cout << " mass " <<pipe_mass(pipe0)<< " kg " << endl;

}
double TotalMassPipes(PIPE pipe[],int ArraySize){
double Total_mass=0, SIZE;
       for(int i=0; i<SIZE; i++){
    Total_mass = Total_mass + pipe_mass(pipe[i]);
}

return Total_mass;
   }
   double TotalMassPipesCu(PIPE pipe[], int ArraySize, char *material){
   double Total_mass_Cu=0, SIZE;
   for(int i=0; i<SIZE; i++){

         Total_mass_Cu =  Total_mass_Cu  + pipe_mass(pipe[i]);
}
return Total_mass_Cu;

 }

 double LenghtPipeline(PIPE pipe[], int ArraySize, char*material){
   double Longest_lenght_Cu=0, SIZE;
   for(int i=0; i<SIZE; i++){

   Longest_lenght_Cu = Longest_lenght_Cu + (pipe[i].lenght);
}
 return  Longest_lenght_Cu;
 }