3 files changed, 20 insertions, 0 deletions

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
--- /dev/null
+++ b/mat/advent/4/a.out
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);
+}