I want to know if I can improve this program. Its goal is to print a pattern in a pyramid form, by first receiving a letter. The first row is always 'A', only. Then 'ABA', then 'ABCBA'. Increasing order, then decreasing.#include <stdio.h>int main(void){    char alphabet[26] = ABCDEFGHIJKLMNOPQRSTUVWXYZ;    char letter;    printf(Enter an uppercase letter: );    scanf(%c, &letter);    letter -= 65;    for (int row = 0; row <= letter; row++)    {        for (int spaces = letter; spaces > row; spaces--)            printf( );        for (char letter2 = 0; letter2 <= row; letter2++)            printf(%c, alphabet[letter2]);        for (char letter3 = 0 + row; --letter3 >= 0; )            printf(%c, alphabet[letter3]);        printf(\n);    }}
Alphabetic Pattern Pyramid
beginner;c;ascii art
Instead of having a static array of chars You could just use ASCII values from 0x41 to 0x5A. If You still insist having a static array, please consider marking it as a const.Leaving Your int main() without any return value --- sign of the bad taste, to say the least. Consider having some proper error codes or at least return 0 on proper exit.Your index of chars (letter2, letter3) can't be negative, so why would You use int instead of uint_* or size_t? Same applies to row and spaces variables.In case of single char, putchar() is way faster then printf(%c, character).