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

/**
 * fill array with increasing numbers starting at 1
 * length to fill
 * if successful, return true
 * if unsuccessful, return false and put message in a_error
 */
bool fill_array(int* numbers, int numbers_len, char** a_error) {
    if (numbers_len < 0) {
        *a_error = "numbers_len cannot be negative";
        return false;
    }
    if (numbers == NULL) {
        *a_error = "numbers cannot be NULL";
        return false;
    }
    for (int i = 0; i < numbers_len; i++) {
        numbers[i] = i + 1;
    }
    return true;
}

int main(int argc, char* argv[]) {
    printf("Array 1\n");
    int array1[5];
    char* error;
    // fill all 5 elements
    bool success = fill_array(array1, 5, &error);
    if (!success) {
        printf("Error filling array: %s\n", error);
    }
    for (int i = 0; i < 5; i++) {
        printf("* %d\n", array1[i]);
    }

    printf("Array 2\n");
    int array2[5];
    array2[4] = 10;
    // fill first 4 elements
    success = fill_array(array2, 4, &error);
    if (!success) {
        printf("Error filling array: %s\n", error);
    }
    for (int i = 0; i < 5; i++) {
        printf("* %d\n", array2[i]);
    }

    printf("array 3\n");    
    int array3[5];
    // fill elements 2, 3, and 4
    success = fill_array(array3 + 1, 3, &error);
    if (!success) {
        printf("Error filling array: %s\n", error);
    }
    for (int i = 0; i < 5; i++) {
        printf("* %d\n", array3[i]);
    }

    
    int array4[5];
    // error: cannot fill negative values
    success = fill_array(array4, -1, &error);
    if (!success) {
        printf("Error filling array: %s\n", error);
    }
    for (int i = 0; i < 5; i++) {
        printf("* %d\n", array4[i]);
    }

    // error: cannot fill negative values
    success = fill_array(NULL, 5, &error);
    if (!success) {
        printf("Error filling array: %s\n", error);
    }
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

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