for (i=0; i<x; i++) {
    q[i]=2*i;
     }

	mpz_t i;    // initialize i as a mpz variable
	mpz_init_set_str (i, "3", 10);   // set i to 3, base 10
	
	mpz_t q[*i];    // initialize array q, with i elements

#include <stdio.h>
#include <iostream>
#include <gmpxx.h>

int main() {

	int i;

	mpz_t q[i];

	for (i=0; i<3; i++) {
		mpz_init_set_str (q[i], "1", 10);   // sets all elements of q to 1
	        }
	
	for (i=0; i<3; i++) {
		mpz_mul_ui (q[i], q[i], i);          // multiplies elements of q by i
		}		
	
	for (i=0; i<3; i++) {
		std::cout<< q[i] <<"\n";           // print elements of q
		}

	return 0;

}

    mpz_t q[i];

    mpz_t *q = new mpz_t[i];
.
.
.
    delete [] q;

#include <iostream>
#include <gmpxx.h>
using namespace std;

int main()
{

    int i;
    int size;

    cout << "Enter the size of the array: ";
    cin >> size;
    if (!cin || (size <= 0)) {
        cout << "Invalid entry. It must be a positive integer." << endl;
    }


    mpz_t *q = new mpz_t[size];

    // Initial array elements to 1
    for (i = 0; i < size; i++) {
        mpz_init_set_str(q[i], "1", 10);
    }

    // Multiply the value by i (So the product will be i)
    for (i = 0; i < size; i++) {
        mpz_mul_ui(q[i], q[i], i);
    }

    // Print them out
    for (i = 0; i < size; i++) {
        cout << q[i] << endl; 
    }

    delete [] q ;

    return 0;

}

    mpz_t zi;
    mpz_init(zi);
    mpz_t zsize;
    mpz_init(zsize);

   // set zsize to some value with mpz_set_ui(zsize, size) or whatever

    for (mpz_set_ui(zi,0); mpz_cmp(zi, zsize) < 0; mpz_add_ui(zi, zi, 1)) {

        // whatever you want to do in the loop.

    }

    mpz_class *q = new mpz_class[siz];
    mpz_class i;
    mpz_class size();

    // Set the value of size for the upper loop limit

    for (i= 0; i < size; i++) {
        // Do whatever you want to do with i
    }

// pseudo-code....

for (i=0; i<size; i++)
     mpz_class a+i;  // such that a+i is a dynamically combined string made up of the number i and the string stored in a.

#include <iostream>
#include <gmpxx.h>

using namespace std;

int main()
{

    int siz;

    cout << "Enter the size of the array: ";
    cin >> siz;
    if (!cin || (siz <= 0)) {
        cout << "Invalid entry. It must be a positive integer." << endl;
    }

    cout << "siz = " << siz << endl;

    //
    // For standard C++: the following will throw an exception and abort
    // if the // system can't give enough memory for the array
    //
    mpz_class *q = new mpz_class[siz]; 
    
    cout << "Allocation OK" << endl;

    mpz_class i;
    mpz_class size(siz); // set value to siz

    // Loop using mpz_class objects 
    for (i= 0; i < size; i++) {
        q[i.get_ui()] = 1;
    }

    //  the value by i (So the product will be i)
    for (i = 0; i < size; i++) {
        q[i.get_ui()] = q[i.get_ui()] * i;
    }

    // Print them out
    for (i = 0; i < size; i++) {
        cout << q[i.get_ui()] << endl; 
    }
    delete [] q ;

    return 0;
}