// gcc -o main main.c -Wl,-z,norelro

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>

uint64_t arr[64] = {0};

void initialize() {
    setvbuf(stdin, NULL, _IONBF, 0);
    setvbuf(stdout, NULL, _IONBF, 0);

    for (int i = 0; i < 64; i++)
        arr[i] = 1ul << i;
}

void print_menu() {
    puts("1. XOR two values");
    puts("2. Print one value");
    printf("> ");
}

void xor() {
    int32_t i, j;
    printf("Enter i & j > ");
    scanf("%d%d", &i, &j);
    arr[i] ^= arr[j];
}

void print() {
    uint32_t i;
    printf("Enter i > ");
    scanf("%d", &i);
    printf("Value: %lx\n", arr[i]);
}

void win() {
    system("/bin/sh");
}

int main() {
    int option, i, j;

    initialize();
    while (1) {
        print_menu();
        scanf("%d", &option);
        if (option == 1) {
            xor();
        } else if (option == 2) {
            print();
        } else {
            break;
        }
    }

    return 0;
}