From 442a49ad5a48d417345959b903ae6a6d32d55759 Mon Sep 17 00:00:00 2001
From: Haidong Ji
Date: Fri, 15 Apr 2022 15:51:30 -0500
Subject: Great C programming fun

Excellent fundamentals and displine training, many tools and techniques
exercises: gdb, emacs, valgrind, git
---
 17_read_arr2/.gitignore |  1 +
 17_read_arr2/Makefile   |  2 ++
 17_read_arr2/README     | 12 ++++++++++++
 17_read_arr2/answer.txt |  8 ++++++++
 17_read_arr2/grade.txt  |  8 ++++++++
 17_read_arr2/test.c     | 27 +++++++++++++++++++++++++++
 6 files changed, 58 insertions(+)
 create mode 100644 17_read_arr2/.gitignore
 create mode 100644 17_read_arr2/Makefile
 create mode 100644 17_read_arr2/README
 create mode 100644 17_read_arr2/answer.txt
 create mode 100644 17_read_arr2/grade.txt
 create mode 100644 17_read_arr2/test.c

(limited to '17_read_arr2')

diff --git a/17_read_arr2/.gitignore b/17_read_arr2/.gitignore
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/17_read_arr2/.gitignore
@@ -0,0 +1 @@
+test
diff --git a/17_read_arr2/Makefile b/17_read_arr2/Makefile
new file mode 100644
index 0000000..f337094
--- /dev/null
+++ b/17_read_arr2/Makefile
@@ -0,0 +1,2 @@
+test: test.c
+	gcc -o test -pedantic -std=gnu99 -Wall -Werror test.c
diff --git a/17_read_arr2/README b/17_read_arr2/README
new file mode 100644
index 0000000..bcdb734
--- /dev/null
+++ b/17_read_arr2/README
@@ -0,0 +1,12 @@
+ 1. Execute the code in "test.c" by hand, and write the output
+    into a file called "answer.txt"
+
+    Hint: you may need to consult the man pages for functions
+    that you are not familiar with.
+
+ 2. Create a Makefile to compile test.c into a program called "test"
+     
+ 3. Run test and use its output to check your work.
+
+ 4. Submit your Makefile and answer.txt
+
diff --git a/17_read_arr2/answer.txt b/17_read_arr2/answer.txt
new file mode 100644
index 0000000..93250fc
--- /dev/null
+++ b/17_read_arr2/answer.txt
@@ -0,0 +1,8 @@
+p
+l
+n
+a
+bannana has nana 3 characters into it!
+r
+o
+fduurw
diff --git a/17_read_arr2/grade.txt b/17_read_arr2/grade.txt
new file mode 100644
index 0000000..d949c21
--- /dev/null
+++ b/17_read_arr2/grade.txt
@@ -0,0 +1,8 @@
+Grading at Fri 15 Oct 2021 02:08:49 AM UTC
+Attempting to compile test.c
+gcc -o test -pedantic -std=gnu99 -Wall -Werror test.c
+compiled
+Your file matched the expected output
+Your output matched what we expected
+
+Overall Grade: A
diff --git a/17_read_arr2/test.c b/17_read_arr2/test.c
new file mode 100644
index 0000000..e0b30b0
--- /dev/null
+++ b/17_read_arr2/test.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define NSTRS 3
+int main(void) {
+  const char * strs[NSTRS] = {"apple", "bannana", "carrot"};
+  
+  for (int i = 0; i < NSTRS; i++) {
+    const char * a = strchr(strs[i], 'a');
+    a++;
+    printf("%c\n", *a);
+    printf("%c\n", a[2]);
+    a = strstr(strs[i], "nana");
+    if (a != NULL) {
+      printf("%s has %s %ld characters into it!\n", strs[i], a, a - strs[i]);
+    }
+  }
+  const char * ptr = strs[2];
+  while (*ptr != '\0') {
+    char x = *ptr + 3;
+    printf("%c", x);
+    ptr++;
+  }
+  printf("\n");
+  return EXIT_SUCCESS;
+}
-- 
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