How does this C for-loop print text-art pyramids?

Question

This is my first time posting in here, hopefully I am doing it right.

Basically I need help trying to figure out some code that I wrote for class using C. The purpose o

Answer 1

#include 

// Please note spacing of
// - functions braces
// - for loops braces
// - equations
// - indentation
int main(void)
{
    // Char holds all the values we want
    // Also, declaire all your variables at the top
    unsigned char user_i;
    unsigned char tall, space, hash;

    // One call to printf is more efficient
    printf("Hello there and welcome to the pyramid creator program\n"
           "Please enter a non negative INTEGER from 0 to 23\n");

    // This is suited for a do-while. Exercise to the reader for adding in a
    // print when user input is invalid.
    do scanf("%d", &user_i);
    while (user_i < 0 || user_i > 23);

    // For each level of the pyramid (starting from the top)...
    // Goes from 0 to user_i - 1
    for (tall = 0; tall < user_i; tall++) {

        // We are going to make each line user_i + 2 characters wide

        // At tall = 0,          this will be user_i + 1                characters worth of spaces
        // At tall = 1,          this will be user_i + 1            - 1 characters worth of spaces
        // ...
        // At tall = user_i - 1, this will be user_i + 1 - (user_i - 1) characters worth of spaces
        for (space = 0; space <= user_i - tall; space++)
            printf(" "); // no '\n', so characters print right next to one another

        //                 because of using '<=' inequality
        //                                                \_  
        // At tall = 0,          this will be          0 + 1 characters worth of hashes
        // At tall = 1,          this will be          1 + 1 characters worth of hashes
        // ...
        // At tall = user_i - 1, this will be user_i - 1 + 1 characters worth of spaces
        for (hash = 0; hash <= tall; hash++)
            printf("#");

        // Level complete. Add a newline to start the next level
        printf("\n");   
    }

    return 0;
}