From 300a343be85905883df27550145e4a687b91f691 Mon Sep 17 00:00:00 2001
From: Zhineng Li <im@zhineng.li>
Date: Wed, 4 Feb 2026 10:30:35 +0800
Subject: ex01-16: print the length of the longest line

---
 ch01/ex16-longest.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 ch01/ex16-longest.c

(limited to 'ch01/ex16-longest.c')

diff --git a/ch01/ex16-longest.c b/ch01/ex16-longest.c
new file mode 100644
index 0000000..d337054
--- /dev/null
+++ b/ch01/ex16-longest.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#define MAXLINE 1000    /* maximum input line size */
+
+int getln(char line[], int maxline);
+void copy(char to[], char from[]);
+
+/* print longest input line */
+int main()
+{
+	int len;	/* current line length */
+	int max;	/* maximum length seen so far */
+	char line[MAXLINE];	/* current input line */
+	char longest[MAXLINE];	/* longest line saved here */
+
+	max = 0;
+	while ((len = getln(line, MAXLINE)) > 0)
+		if (len > max) {
+			max = len;
+			copy(longest, line);
+		}
+	if (max > 0)	/* there was a line */
+		printf("%d %s", max, longest);
+	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;
+}
+
+/* copy:  copy `from` into `to`; assume to is big enough */
+void copy(char to[], char from[])
+{
+	int i;
+
+	i = 0;
+	while ((to[i] = from[i]) != '\0')
+		++i;
+}
-- 
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