Написать рекурсивную и нерекурсивную программу

#include<iostream>
#include<conio.h>
using namespace std;
 
int Recursion(intx, inty, intz, intt)
{
    int res = 0;
    if(t == 0) res = x + y + z;
        else res = (Recursion(x, y, z, t-1)+1)*(x + z);
    return res;
}
 
int Normal(intx, inty,  intz, intt){
int res = x + y + z;
        for(int i = 1; i<= t; i++){ res = (res+1)*((i-1) + x*y);}
    
    return res;
}
 
int main()
{
    longint x, y, z, t;
    do{
        cout<<"Enter x, y, z, t: "; cin>> x; cin>> y; cin>> z, cin>> t;
        cout<<" Recursion: f("<< x <<","<< y <<","<< z <<","<< t <<") = "<< Recursion(x, y, z, t) <<endl;
        cout<<" Normal: f("<< x <<","<< y <<","<< z <<","<< t <<") = "<< Normal(x, y, z, t) <<endl;
        cout<<"Press any key to continue or Esc!"<<endl<<endl;
    }
    while(getch() != 27);
    return 0;
}

for(int i = 1; i<= t; i++){ res = (res+1)*((i-1) + x*y);}

for(int i = 1; i<= t; i++){ res = (res+1)*((i-1) + x*y);}

for(int i = 1; i<= t; i++){ res = (res+1)*(x + z);}