#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

#define FAVORITE_NUMBER 4
const int SECOND_FAVORITE_NUMBER = 7;

#define HELLO "Hello World"
const char* MESSAGE = "Hello ECE 264";

const int IMPORTANT_NUMBERS[] = {1, 2, 3, 4};
// this does not work as you might expect
#define NUMBERS { 1, 2, 3, 4 }
// this is weird but works, though it pretty inefficient
#define NUMBER_COMPOUND_INITIALIZER ((int[]){ 1, 2, 3, 4 })

int main(int argc, char* argv[]) {
/*  SECOND_FAVORITE_NUMBER = 10;
constants.c: In function 'main':
constants.c:10:32: error: assignment of read-only variable 'SECOND_FAVORITE_NUMBER'
   10 |         SECOND_FAVORITE_NUMBER = 10;
      |                                ^
          */
/*  FAVORITE_NUMBER = 10;
constants.c: In function 'main':
constants.c:11:25: error: lvalue required as left operand of assignment
   11 |         FAVORITE_NUMBER = 10;
      |                         ^
          */
    printf("My favorite number is %d\n", FAVORITE_NUMBER);
    printf("My second favorite number is %d\n", SECOND_FAVORITE_NUMBER);

    printf("Message %s\n", HELLO);
    printf("Message %s\n", MESSAGE);

    printf("First important number %d\n", IMPORTANT_NUMBERS[0]);
    // this invalid
    //printf("First important number %d\n", NUMBERS[0]);
    //this is valid
    int numbers[] = NUMBERS;
    printf("First important number %d\n", numbers[0]);
    printf("First important number %d\n", NUMBER_COMPOUND_INITIALIZER[0]);

    return EXIT_SUCCESS;
}
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