From cae0c0f2d40e2ced764c99a80ccc065e7c5e3819 Mon Sep 17 00:00:00 2001
From: sijanec <sijanecantonluka@gmail.com>
Date: Mon, 7 Dec 2020 12:15:55 +0100
Subject: advent 4

---
 mat/advent/4/Makefile |   2 ++
 mat/advent/4/a.out    | Bin 0 -> 8432 bytes
 mat/advent/4/prog.c   |  18 ++++++++++++++++++
 3 files changed, 20 insertions(+)
 create mode 100644 mat/advent/4/Makefile
 create mode 100755 mat/advent/4/a.out
 create mode 100644 mat/advent/4/prog.c

diff --git a/mat/advent/4/Makefile b/mat/advent/4/Makefile
new file mode 100644
index 0000000..4296acc
--- /dev/null
+++ b/mat/advent/4/Makefile
@@ -0,0 +1,2 @@
+default:
+	gcc prog.c -pedantic
diff --git a/mat/advent/4/a.out b/mat/advent/4/a.out
new file mode 100755
index 0000000..ad1aa04
Binary files /dev/null and b/mat/advent/4/a.out differ
diff --git a/mat/advent/4/prog.c b/mat/advent/4/prog.c
new file mode 100644
index 0000000..87dfa5e
--- /dev/null
+++ b/mat/advent/4/prog.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main (int argc, char ** argv) {
+	if (argc != 1+1) {
+		fprintf(stderr, "uporaba: %s <dolzina stranice kvadratne mreze>\nprimer za šahovnico: %s 8\n", argv[0], argv[0]);
+		return 1;
+	}
+	unsigned long int n = strtol(argv[1], NULL, 10);
+	unsigned long int x = 1;
+	unsigned long int y = 1;
+	unsigned long int s = 0;
+	for (x = 1; x <= n; x++) {
+		fprintf(stderr, "debug: x == %lu\n", x);
+		for (y = 1; y <= n; y++)
+			s = s + x * y;
+	}
+	fprintf(stdout, "seštevek možnih pravokotnikov v mreži %lux%lu je %lu\n", n, n, s);
+}
-- 
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