Can someone explain me how the for loop reverses the elements in the array?

The purpose of the program: Convert a decimal number into a binary number.

My Question: How does the for loop work here printing the elements in reverse in the array? What does for(i=i-1; i>=0; i--) mean?

(I would also appreciate it, if you give me some feedback about my code, and how to make it look good and better, Thanks!)

#include <stdio.h>

int main()
{
  int i;
  int num;
  int BinArray[32];
   
  printf("Enter a decimal number: ");

  scanf("%d", &num);
   
  for(i=0; num>0; i++){
      
     if(num % 2 == 0)
        BinArray[i] = 0;
     else
        BinArray[i] = 1;     
        num = num / 2;
    }

    // I don't understand how it prints the binary numbers in reverse
    // (from right to left); what happened?

    for(i=i-1; i>=0; i--) {
        printf("%d", BinArray[i]);
    } 

    return 0;
}

>Solution :

The variable i contains the number of elements entered in this loop

for(i=0; num>0; i++){
  
  if(num % 2 == 0)
    BinArray[i] = 0;
  else
    BinArray[i] = 1;
    
    num = num / 2;
}

because after assigning a new value to an element of the array BinArray the variable i is incremented in the for loop i++.

So i - 1 points to the last element of the array BinArray. Starting from this last element up to the element with the index equal to 0 (because the variable i is decremented i--) all elements of the array are outputted in this for loop

for(i=i-1; i>=0; i--) {
    printf("%d", BinArray[i]);
}