Add some theory about arrays

c_modern_approach/Arrays/theory.c

@@ -0,0 +1,45 @@
+#include <stddef.h>
+#include <stdio.h>
+#define N 10
+
+/**
+ * @brief Function for printing the array elements
+ *
+ * @param x - pointer to array
+ * @param size - size of an array
+ */
+void print_array(int *x, size_t size) {
+  printf("Array started with size == %zu\n", size);
+  for (int i = 0; i < size; i++) {
+    if (i == size - 1) {
+      printf("%d\nArray ended\n", x[i]);
+    } else {
+      printf("%d, ", x[i]);
+    }
+  }
+}
+
+int main() {
+  /* Array initialization */
+  int a[N] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+  print_array(a, N);
+
+  /* Partial array initialization */
+  int b[N] = {1, 23, 4};
+  print_array(b, N);
+
+  /* Initialization without size */
+  int c[] = {10000000, 3, 4};
+  /* In print beneath we are calculating size of an array by taking the whole
+   * memory of array and dividing it by size of an element in it
+   */
+  printf("%lu : %lu\n", sizeof(c), sizeof(c[0]));
+  print_array(c, sizeof(c) / sizeof(c[0]));
+  /* Designated initializers */
+  int d[N] = {[2] = 15, [9] = 10};
+  print_array(d, N);
+
+  /* Designated initializers without fixed size */
+  int e[] = {[2] = 15, [9] = 10, [154] = 1};
+  print_array(e, sizeof(e) / sizeof(e[0]));
+}