зачем нужен параметр

#include"otobrazenie.h"
#include "primary.h"
#include <iostream>
#include "execution.h"
#include"output.h"
#include"input.h"
using namespace std;
 
static bool htenie(sequence& app);//fynkziya zapolneniya massiva (ispolzyet modyl vvoda znacheniy s klaviatyri)
 
 
int launch(sequence& app)//fynkziya proverki massiva ,i kompanovki  fynkziy
{
    if ( !htenie(app) ) {
        cout << "ohibka!" << endl;
        return 1;
    }
    int b=0;
    b=add_num(app.b);
    int x=otobrazenie(app.first);//otobrajenie
    int k=execution(app.first,b);//execution
    otvet(app.first);//otvet
    return 0;
}
 
static bool htenie(sequence& app)
{
    cout << "Enter the number of numbers in the sequence:";
    unsigned size;
    cin >> size;
    app.first.resize(size);//perenaznachaem razmer massiva
    cout << "Enter the sequence:"<<endl;
    add(app.first);//vizivaem fyncziy vvoda 
    return true; 
}

//primary.h
//
#ifndef primary_h
#define primary_h
#include "execution.h"
 
 
struct sequence
    { 
     vec first;
     int b;
    };
 
 
int launch(sequence& app);
 
#endif