Initial data commit

Task/Array-length/C/array-length-3.c

@@ -0,0 +1,76 @@
+#define _CRT_SECURE_NO_WARNINGS    // turn off panic warnings
+#define _CRT_NONSTDC_NO_WARNINGS   // enable old-gold POSIX names in MSVS
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+
+struct StringArray
+{
+    size_t sizeOfArray;
+    size_t numberOfElements;
+    char** elements;
+};
+typedef struct StringArray* StringArray;
+
+StringArray StringArray_new(size_t size)
+{
+    StringArray this = calloc(1, sizeof(struct StringArray));
+    if (this)
+    {
+        this->elements = calloc(size, sizeof(int));
+        if (this->elements)
+            this->sizeOfArray = size;
+        else
+        {
+            free(this);
+            this = NULL;
+        }
+    }
+    return this;
+}
+
+void StringArray_delete(StringArray* ptr_to_this)
+{
+    assert(ptr_to_this != NULL);
+    StringArray this = (*ptr_to_this);
+    if (this)
+    {
+        for (size_t i = 0; i < this->sizeOfArray; i++)
+            free(this->elements[i]);
+        free(this->elements);
+        free(this);
+        this = NULL;
+    }
+}
+
+void StringArray_add(StringArray this, ...)
+{
+    char* s;
+    va_list args;
+    va_start(args, this);
+    while (this->numberOfElements < this->sizeOfArray && (s = va_arg(args, char*)))
+        this->elements[this->numberOfElements++] = strdup(s);
+    va_end(args);
+}
+
+
+int main(int argc, char* argv[])
+{
+    StringArray a = StringArray_new(10);
+    StringArray_add(a, "apple", "orange", NULL);
+
+    printf(
+        "There are %d elements in an array with a capacity of %d elements:\n\n",
+        a->numberOfElements, a->sizeOfArray);
+
+    for (size_t i = 0; i < a->numberOfElements; i++)
+        printf("    the element %d is the string \"%s\"\n", i, a->elements[i]);
+
+    StringArray_delete(&a);
+
+    return EXIT_SUCCESS;
+}