5 files changed, 41 insertions, 0 deletions
diff --git a/mat/advent/4/Makefile b/mat/advent/4/Makefile
new file mode 100644
index 0000000..cb76e0f
--- /dev/null
+++ b/mat/advent/4/Makefile
@@ -0,0 +1,3 @@
+default:
+	gcc prog.c -pedantic
+	gcc n1.c -pedantic -o n1
diff --git a/mat/advent/4/a.out b/mat/advent/4/a.out
new file mode 100755
index 0000000..c1c724c
--- /dev/null
+++ b/mat/advent/4/a.out
diff --git a/mat/advent/4/n1 b/mat/advent/4/n1
new file mode 100755
index 0000000..9d59953
--- /dev/null
+++ b/mat/advent/4/n1
diff --git a/mat/advent/4/n1.c b/mat/advent/4/n1.c
new file mode 100644
index 0000000..157d60d
--- /dev/null
+++ b/mat/advent/4/n1.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+int main (int argc, char ** argv) {
+	if (argc != 1+2) {
+		fprintf(stderr, "uporaba: %s <število> <število>\nprimer-število deliteljev 3019, ki niso delitelji 2020: %s 3019 2020\n", argv[0], argv[0]);
+		return 1;
+	}
+	unsigned long int n = strtol(argv[1], NULL, 10);
+	unsigned long int o = strtol(argv[2], NULL, 10);
+	unsigned long int i = 0;
+	unsigned long int s = 0;
+	unsigned long int d = 0;
+	for (i = 1; i <= n; i++)
+		if (n % i == 0) {
+			d++;
+			if (o % i != 0)
+				s++;
+		}
+	fprintf(stdout, "števil, ki delijo %lu (=%lu), ne pa %lu, je %lu\n", n,d,o,s);
+	return 0;
+}
diff --git a/mat/advent/4/prog.c b/mat/advent/4/prog.c
new file mode 100644
index 0000000..a50524f
--- /dev/null
+++ b/mat/advent/4/prog.c
@@ -0,0 +1,16 @@
+#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++)
+		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);
+}