diff --git a/chp3/binarydata.c b/chp3/binarydata.c
new file mode 100644
index 0000000..cae1965
--- /dev/null
+++ b/chp3/binarydata.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+
+int main(void) {
+    FILE *in, *out;
+    struct pirate {
+        char name[100];         /* real name */
+        unsigned long booty;    /* in pounds sterling */
+        unsigned int beard_len; /* in inches */
+    } p, blackbeard = {"Edward Teach", 950, 48};
+
+    out = fopen("data", "w");
+    if (!out) {
+        perror("fopen");
+        return 1;
+    }
+    if (!fwrite(&blackbeard, sizeof(struct pirate), 1, out)) {
+        perror("fwrite");
+        return 1;
+    }
+    if (fclose(out)) {
+        perror("fclose");
+        return 1;
+    }
+
+    in = fopen("data", "r");
+    if (!in) {
+        perror("fopen");
+        return 1;
+    }
+    if (!fread(&p, sizeof(struct pirate), 1, in)) {
+        perror("fread");
+        return 1;
+    }
+    if (fclose(in)) {
+        perror("fclose");
+        return 1;
+    }
+    printf("name=\"%s\" booty=%lu beard_len=%u\n", p.name, p.booty, p.beard_len);
+    return 0;
+}
diff --git a/chp3/input.c b/chp3/input.c
new file mode 100644
index 0000000..3e72a56
--- /dev/null
+++ b/chp3/input.c
@@ -0,0 +1,7 @@
+#include<stdio.h>
+#include <limits.h>
+
+int main(void) {
+    printf("Limit buffer size is %u bytes.\n", LINE_MAX);
+    printf("Buffer size is %u bytes.\n", BUFSIZ);
+}