gcc -o foo foo.c -lm -O1

const long long int max = 1LL << n;
for (long long int i = 0; i < max; i++)

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>

int main() {
    int n;

    printf("Enter the value of n: ");
    scanf("%d", &n);

    clock_t start_bitshifting = clock();
    const long long int MAX1 = 1LL << n;
    for (long long int i = 0; i < MAX1; i++) {
    }
    clock_t end_bitshifting = clock();

    clock_t start_pow = clock();
    const long long int MAX2 = pow(2, n);
    for (long long int i = 0; i < MAX2; i++) {
    }
    clock_t end_pow = clock();

    double time_bitshifting = ((double) (end_bitshifting - start_bitshifting)) / CLOCKS_PER_SEC;
    double time_pow = ((double) (end_pow - start_pow)) / CLOCKS_PER_SEC;

    printf("Time taken for bit shifting method: %f seconds\n", time_bitshifting);
    printf("Time taken for pow function method: %f seconds\n", time_pow);

    return 0;
}

#include <stdio.h>
#include <gmp.h>

int main() {
    // define a 256-bit integer
    mpz_t maxIterations;
    mpz_init2(maxIterations, 256);

    // maxIterations = ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
    mpz_set_str(maxIterations, "115792089237316195423570985008687907853269984665640564039457584007913129639935", 10);

    mpz_t currentIteration;
    mpz_init(currentIteration);

    while (mpz_cmp(currentIteration, maxIterations) < 0) {
        // print the iteration
        gmp_printf("Iteration %Zx\n", currentIteration);

        // increment it
        mpz_add_ui(currentIteration, currentIteration, 1);
    }

    mpz_clear(maxIterations);
    mpz_clear(currentIteration);

    return 0;
}

#include <stdio.h>
#define MAX __UINT64_MAX__

int main() {
    unsigned long long int x, y;

    for(x = 1; x <= MAX; x++)
        for(y = 1; y <= MAX; y++)
            printf("%llu + %llu*i\n", x, y);
        
    return 0;
}

int end_number = 2 << n;