From 6c133eab750473e3b0e1a342fafe55ba6f1a9c93 Mon Sep 17 00:00:00 2001
From: Zhineng Li <im@zhineng.li>
Date: Wed, 4 Feb 2026 10:49:18 +0800
Subject: ch01-17: print lines that are longer than 80 characters

---
 ch01/ex17-print.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 ch01/ex17-print.c

diff --git a/ch01/ex17-print.c b/ch01/ex17-print.c
new file mode 100644
index 0000000..35bb18a
--- /dev/null
+++ b/ch01/ex17-print.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#define MAXLINE 1000	/* maximum input line size */
+
+int getln(char line[], int maxline);
+
+/* print lines that are longer than 80 characters */
+int main()
+{
+	int len;	/* current line length */
+	char line[MAXLINE];	/* current input line */
+
+	while ((len = getln(line, MAXLINE)) > 0)
+		if (len > 80)
+			printf("%s", line);
+	return 0;
+}
+
+/* getln:  read a line into s, return length */
+int getln(char s[], int lim)
+{
+	int c, i;
+
+	for (i=0; i<lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
+		s[i] = c;
+	if (c == '\n') {
+		s[i] = c;
+		++i;
+	}
+	s[i] = '\0';
+	return i;
+}
-- 
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