C Array Demonstration, C (gcc)

C Array Demonstration

//gcc 5.4.0

// Simple Array Demonstration

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

typedef struct {
    int *data;
    int length;
    int allocLength;
} array;

void array_resize (array *arr, int newLength);

array array_new (int startLength) {
    array arr;
    arr.length = 0;
    arr.allocLength = startLength;
    arr.data = malloc(sizeof(int) * startLength);
    return arr;
}
void array_push (array *arr, int x) {
    if(arr->allocLength == arr->length) {
        array_resize(arr, arr->allocLength * 2);
    }
    arr->data[arr->length] = x;
    ++arr->length;
}
void array_print (array *arr) {
    int i;
    for(i=0; i<arr->length; i++) {
        printf("[%d] = %d\n", i, arr->data[i]);
    }
}
void array_resize (array *arr, int newLength) {
    arr->data = realloc(arr->data, sizeof(int) * newLength);
    arr->allocLength = newLength;
}
int compare_int(int *el1, int *el2) {
    return *el1 - *el2;
}
void array_sort(array *arr) {
    qsort(arr->data, arr->length, sizeof(int), compare_int );
}
void array_destroy (array *arr) {
    free(arr->data);
}

int main(void)
{
    array myArr = array_new(10);
    array_push(&myArr, 1);
    array_push(&myArr, 42);
    array_push(&myArr, 25);
    array_push(&myArr, 9);
    array_push(&myArr, 69);
    array_print(&myArr);
    
    printf("\nLength of array: %d\n", myArr.length);
    
    int i = 4;
    printf("Element [%d] = %d\n", i, myArr.data[i]);
    
    printf("\nSorted:\n");
    array_sort(&myArr);
    array_print(&myArr);
    
    array_destroy(&myArr);
    return 0;
}


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