Christmas tree program in C language

Here, we will see an interesting question. In this question we will see how to randomly print a Christmas tree. As a result, the tree will twinkle like Christmas tree lights.

To print the Christmas tree, we will print pyramids of various sizes, placed one on top of the other. For decorative leaves, a random character will be printed from the given list of characters. Height and randomness are adjustable.

After the tree is generated, the whole screen is cleared and then generated again, that's why it looks like a flickering tree.

Example

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define REFRESH_RATE 40000
#define RANDOM_NESS 5 // The higer value indicates less random
void clear_screen() {
   system("@cls||clear");
}
void display_random_leaf() {
   char type_of_leaves[5] = { &#39;.&#39;, &#39;*&#39;, &#39;+&#39;, &#39;o&#39;, &#39;O&#39; }; //these are the leaf types
   int temp = rand() % RANDOM_NESS;
   if (temp == 1)
      printf("%c ", type_of_leaves[rand() % 5]); //if temp is 1, then use other leaves
   else
      printf("%c ", type_of_leaves[1]); //otherwise print *
}
void tree_triangle(int f, int n, int toth) {
   int i, j, k = 2 * toth - 2;
   for (i = 0; i < f - 1; i++)
      k--;
   for (i = f - 1; i < n; i++) { //i will point the number of rows
      for (j = 0; j < k; j++) // Used to put spaces
      printf(" ");
         k = k - 1;
      for (j = 0; j <= i; j++)
         display_random_leaf();
      printf("</p><p>");
   }
}
void display_tree(int h) {
   int start = 1, end = 0, diff = 3;
   while (end < h + 1) {
      end = start + diff;
      tree_triangle(start, end, h);
      diff++;
      start = end - 2;
   }
}
void display_log(int n) { //print the log of the tree
   int i, j, k = 2 * n - 4;
   for (i = 1; i <= 6; i++) {
      for (j = 0; j < k; j++)
         printf(" ");
      for (j = 1; j <= 6; j++)
         printf("#");
      printf("</p><p>");
   }
}
main() {
   srand(time(NULL));
   int ht = 15;
   while (1) {
      clear_screen();
      display_tree(ht);
      display_log(ht);
      usleep(REFRESH_RATE); //use sleep before replacing
   }
}

Output

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