From a1bac88d7da40ae9c9363cb51a25111d35c54835 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Kl=C3=A9ger?= <klegetom@fit.cvut.cz>
Date: Sun, 5 Oct 2025 21:56:30 +0200
Subject: [PATCH] homework-00: Comment code

---
 homework-00-warmup/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/homework-00-warmup/main.c b/homework-00-warmup/main.c
index 8b14087..a10c67b 100644
--- a/homework-00-warmup/main.c
+++ b/homework-00-warmup/main.c
@@ -29,16 +29,24 @@ int main() {
 
 	printf("%s\n", PROMPT);
 
+	// Use getline for dynamic allocation
 	ssize_t chars_read = getline(&buf, &len, stdin);
 
 	errno = 0;
 	long input = strtol(buf, &end, 10);
 
+	// Check whether a range error occured or
+	// No characters were read by getline
+	// or check that strtol didnt move a single char
 	if(errno == ERANGE || chars_read == -1 || end == &buf[0]) {
 		printf("%s\n", NOT_A_NUMBER);
 		return EXIT_FAILURE;
 	}
 
+	// getline always adds the \n to the result string
+	// If the ending char by strtol is not that newline
+	// It means the string is not a whole number
+	// (e.g. 12abc, 1.23)
 	if(*end != '\n') {
 		printf("%s\n", INVALID_NUMBER);
 		return EXIT_FAILURE;