diff --git a/data/broadcast.c b/data/broadcast.c
new file mode 100644
index 0000000..b2129e7
--- /dev/null
+++ b/data/broadcast.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main() {
+	unsigned int ip[4];
+	unsigned int netmask[4];
+	unsigned int broadcast[4] = {0, 0, 0, 0};
+	int i;
+
+	scanf("%d.%d.%d.%d", &ip[0], &ip[1], &ip[2], &ip[3]);
+	scanf("%d.%d.%d.%d", &netmask[0], &netmask[1], &netmask[2], &netmask[3]);
+	for (i = 0; i < 4; ++i) {
+		broadcast[i] = (ip[i] & netmask[i]) | (~netmask[i] & 255);
+	}
+	for (i = 0; i < 3; ++i)
+		printf("%d.", broadcast[i]);
+	printf("%d", broadcast[3]);
+}
diff --git a/data/complement.c b/data/complement.c
new file mode 100644
index 0000000..b1c026d
--- /dev/null
+++ b/data/complement.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main() {
+	int i;
+	char y;
+	scanf("%hhd", &y);
+
+	if (y < 0)
+		y = ~(-y) + 1;
+
+	for (i = 7; i >= 0; --i) {
+		printf("%d", (y >> i) & 1);
+	}
+	return 0;
+}
diff --git a/data/size.c b/data/size.c
new file mode 100644
index 0000000..5383565
--- /dev/null
+++ b/data/size.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <string.h>
+
+int main() {
+	char s;
+	int len_f = 0;
+	int len_d = 0;
+	int len_ld = 0;
+	s = getchar();
+	
+	float xf = 0.5;
+	double xd = 0.5;
+	long double xld = 0.5;
+
+	for (; (float)1.0 + xf != (float)1.0; ++len_f, xf /= 2);
+	for (; 1.0 + xd != 1.0; ++len_d, xd /= 2);
+	for (; 1.0 + xld != 1.0; ++len_ld, xld /= 2);
+	
+	if (s == 'f') {
+		printf("%d", len_f);
+	}
+	if (s == 'd') {
+		printf("%d", len_d);
+	}
+	if (s == 'l') {
+		printf("%d", len_ld);
+	}
+
+}