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
---
 18_reverse_str/.gitignore      |  1 +
 18_reverse_str/Makefile        |  2 ++
 18_reverse_str/README          | 15 +++++++++++++++
 18_reverse_str/grade.txt       | 18 ++++++++++++++++++
 18_reverse_str/reverse.c       | 39 +++++++++++++++++++++++++++++++++++++++
 18_reverse_str/reverse_ans.txt |  7 +++++++
 6 files changed, 82 insertions(+)
 create mode 100644 18_reverse_str/.gitignore
 create mode 100644 18_reverse_str/Makefile
 create mode 100644 18_reverse_str/README
 create mode 100644 18_reverse_str/grade.txt
 create mode 100644 18_reverse_str/reverse.c
 create mode 100644 18_reverse_str/reverse_ans.txt

(limited to '18_reverse_str')

diff --git a/18_reverse_str/.gitignore b/18_reverse_str/.gitignore
new file mode 100644
index 0000000..3ddc7c0
--- /dev/null
+++ b/18_reverse_str/.gitignore
@@ -0,0 +1 @@
+reverse
diff --git a/18_reverse_str/Makefile b/18_reverse_str/Makefile
new file mode 100644
index 0000000..784a04a
--- /dev/null
+++ b/18_reverse_str/Makefile
@@ -0,0 +1,2 @@
+reverse: reverse.c
+	gcc -o reverse -pedantic -std=gnu99 -Wall -Werror reverse.c
diff --git a/18_reverse_str/README b/18_reverse_str/README
new file mode 100644
index 0000000..af46aa6
--- /dev/null
+++ b/18_reverse_str/README
@@ -0,0 +1,15 @@
+For this problem, you will write the function
+
+  void reverse(char * str) 
+
+in the provided reverse.c file.  This function should reverse the string
+passed into it (that is, if given "abc", it should change the contents
+of that string to read "cba"). Note that this function's return type
+is "void"---it modifies the string passed into it in place.
+
+We have provided a main function which you can use to test your
+reverse function (do you recognize the quotations?).  The correct
+output for your program can be found in reverse_ans.txt, so you can
+diff your program's output against it.
+
+Submit your reverse.c file for grading.
diff --git a/18_reverse_str/grade.txt b/18_reverse_str/grade.txt
new file mode 100644
index 0000000..594c87c
--- /dev/null
+++ b/18_reverse_str/grade.txt
@@ -0,0 +1,18 @@
+Grading at Sat 16 Oct 2021 01:39:49 AM UTC
+Attempting to compile  reverse.c
+Your file matched the expected output
+Your output matched what we expected
+Removing your main() and replacing it with our own to run more tests...
+#################################################
+testcase2:
+nullptr#################################################
+testcase3:
+Your file matched the expected output
+#################################################
+testcase4:
+Your file matched the expected output
+#################################################
+testcase5:
+Your file matched the expected output
+
+Overall Grade: A
diff --git a/18_reverse_str/reverse.c b/18_reverse_str/reverse.c
new file mode 100644
index 0000000..bea6e4e
--- /dev/null
+++ b/18_reverse_str/reverse.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void reverse(char * str) {
+  if (!str) {
+    return;
+  }
+  size_t string_length = 0;
+  char temp;
+  const char * ptr = str;
+  // Find string length
+  while (*ptr != '\0') {
+    string_length++;
+    ptr++;
+  }
+
+  for (size_t i = 0; i < (string_length/2); i++) {
+    temp = str[i];
+    str[i] = str[string_length-1-i];
+    str[string_length-1-i] = temp;
+  }
+}
+
+int main(void) {
+  char str0[] = "";
+  char str1[] = "123";
+  char str2[] = "abcd";
+  char str3[] = "Captain's log, Stardate 42523.7";
+  char str4[] = "Hello, my name is Inigo Montoya.";
+  char str5[] = "You can be my wingman anyday!";
+  char str6[] = "Executor Selendis! Unleash the full power of your forces! There may be no tomorrow!";
+  char * array[] = {str0, str1, str2, str3, str4, str5, str6};
+  for (int i = 0; i < 7; i++) {
+    reverse(array[i]);
+    printf("%s\n", array[i]);
+  }
+  return EXIT_SUCCESS;
+}
diff --git a/18_reverse_str/reverse_ans.txt b/18_reverse_str/reverse_ans.txt
new file mode 100644
index 0000000..7b70ecc
--- /dev/null
+++ b/18_reverse_str/reverse_ans.txt
@@ -0,0 +1,7 @@
+
+321
+dcba
+7.32524 etadratS ,gol s'niatpaC
+.ayotnoM oginI si eman ym ,olleH
+!yadyna namgniw ym eb nac uoY
+!worromot on eb yam erehT !secrof ruoy fo rewop lluf eht hsaelnU !sidneleS rotucexE
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