Great C programming funHEADmaster

Excellent fundamentals and displine training, many tools and techniques
exercises: gdb, emacs, valgrind, git

5 files changed, 96 insertions, 0 deletions

diff --git a/14_array_max/.gitignore b/14_array_max/.gitignore
new file mode 100644
index 0000000..bdf4bbd
--- /dev/null
+++ b/14_array_max/.gitignore
@@ -0,0 +1 @@
+arrayMax
diff --git a/14_array_max/Makefile b/14_array_max/Makefile
new file mode 100644
index 0000000..51fb361
--- /dev/null
+++ b/14_array_max/Makefile
@@ -0,0 +1,2 @@
+arrayMax: arrayMax.c
+	gcc -o arrayMax -pedantic -std=gnu99 -Wall -Werror arrayMax.c
diff --git a/14_array_max/README b/14_array_max/README
new file mode 100644
index 0000000..e98f467
--- /dev/null
+++ b/14_array_max/README
@@ -0,0 +1,16 @@
+ 1. Open the provided arrayMax.c file and write
+    the function:
+      int * arrayMax(int * array, int n);
+    which returns a pointer to the largest element
+    in the array passed in (whose length is n).
+    If the array has no elements (n is 0), this function
+    should return NULL.
+
+ 2. Compile and test your code. 
+    We have provided a main function which will print test cases
+    and your function's answer for them. You should get
+    99, -3, 425, NULL, and NULL for the 5 test provided.
+
+ 3. Submit your code.
+
+     
diff --git a/14_array_max/arrayMax.c b/14_array_max/arrayMax.c
new file mode 100644
index 0000000..5fc5d62
--- /dev/null
+++ b/14_array_max/arrayMax.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int * arrayMax(int * array, int n) {
+  if (n == 0){
+    return NULL;
+  }
+  int maxInt = array[0];
+  int * answer = array;
+  for (int i = 1; i < n; i++) {
+    if (array[i] > maxInt) {
+      maxInt = array[i];
+      answer = &array[i];
+    }
+  }
+  return answer;
+}
+
+void doTest(int * array, int n) {
+  printf("arrayMax(");
+  if (array == NULL) {
+    printf("NULL");
+  }
+  else {
+    printf("{");
+    for (int i =0; i < n; i++) {
+      printf("%d", array[i]);
+      if (i < n -1) {
+	printf(", ");
+      }
+    }
+    printf("}");
+  }
+  printf(", %d) is \n", n);
+  int * p = arrayMax (array, n);
+  if (p == NULL) {
+    printf("NULL\n");
+  }
+  else {
+    printf("%d\n", *p);
+  }
+}
+
+int main(void) {
+  int array1[] = { 77, 33, 19, 99, 42, 6, 27, 4};
+  int array2[] = { -3, -42, -99, -1000, -999, -88, -77};
+  int array3[] = { 425, 59, -3, 77, 0, 36};
+
+  doTest (array1, 8);
+  doTest (array2, 7);
+  doTest (array3, 6);
+  doTest (NULL, 0);
+  doTest (array1, 0);
+  
+  return EXIT_SUCCESS;
+}
diff --git a/14_array_max/grade.txt b/14_array_max/grade.txt
new file mode 100644
index 0000000..3b969b3
--- /dev/null
+++ b/14_array_max/grade.txt
@@ -0,0 +1,21 @@
+Grading at Wed 13 Oct 2021 02:00:59 AM UTC
+Attempting to compile arrayMax.c 
+#################################################
+testcase1:
+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:
+array size:0 was Correct
+#################################################
+testcase3:
+array size:1 was Correct
+#################################################
+testcase4:
+array size:100 was Correct
+#################################################
+testcase5:
+array size:5000 was Correct
+
+Overall Grade: A