#!/usr/bin/env cscript
#include <stdio.h>

void
cast_column_index(char *column_index_string, int column_index) {
	int needle_column_index_string = 0;

	while (column_index > 0) {
		column_index_string[needle_column_index_string] = column_index % (26 + 1) + 'A' - 1;
		column_index /= 26;
	}
}

int
main(int argc, char *argv[]) {
	char column_index_string[3 + 1] = {0};
	cast_column_index(column_index_string, 1);
	printf("1 → %s\n", column_index_string);
	return 0;
}