Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Using C++ Implement the ordered version of removeElement in the window below. Your function should validate inputs and remove the element in the given position by moving all of the other elements down.

// removeElement preserves the order of the remaining elements in the array.
// @param: char array that is ordered in some way.
// @param: int numElems is the number of elements
// @param: int position of the element being removed
// @returns true if the element is removed, false otherwise.
// be careful to use reference parameters where necessary!

### Test Case Code Explanation

The following test cases are written in C++ and aim to validate the behavior of functions related to character array manipulation. Below are the descriptions for each test case:

---

#### Test Case 1:
```cpp
const int MAX_CHARS=20;
char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' };
char a2[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' };
int numElems = 7;
ASSERT_TRUE(removeElement(a2, numElems, 2));
ASSERT_TRUE(numElems == 6);
ASSERT_TRUE(std::equal(a1, a1+6, a2));
```

**Explanation:**
- **Purpose:** This test checks if the function `removeElement` successfully removes an element from the array `a2` at index `2`.
- **Assertions:**
  - The element at index 2 should be removed. 
  - `numElems` should be decremented to `6`.
  - The modified array `a2` should match the first six elements of `a1`.

---

#### Test Case 2:
```cpp
const int MAX_CHARS=20;
char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' };
char a2[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' };
int numElems = 7;
ASSERT_TRUE(removeElement(a1, numElems, numElems-1));
ASSERT_TRUE(numElems == 6);
ASSERT_TRUE(std::equal(a1, a1+6, a2));
```

**Explanation:**
- **Purpose:** Checks if the `removeElement` function can remove the last element from `a1`.
- **Assertions:**
  - The last element of `a1` should be removed.
  - `numElems` should be updated to `6`.
  - The modified `a1` should match the first six elements of `a2`.

---

#### Test Case 3:
```cpp
const int MAX_CHARS=20;
char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f',
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Transcribed Image Text:### Test Case Code Explanation The following test cases are written in C++ and aim to validate the behavior of functions related to character array manipulation. Below are the descriptions for each test case: --- #### Test Case 1: ```cpp const int MAX_CHARS=20; char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' }; char a2[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' }; int numElems = 7; ASSERT_TRUE(removeElement(a2, numElems, 2)); ASSERT_TRUE(numElems == 6); ASSERT_TRUE(std::equal(a1, a1+6, a2)); ``` **Explanation:** - **Purpose:** This test checks if the function `removeElement` successfully removes an element from the array `a2` at index `2`. - **Assertions:** - The element at index 2 should be removed. - `numElems` should be decremented to `6`. - The modified array `a2` should match the first six elements of `a1`. --- #### Test Case 2: ```cpp const int MAX_CHARS=20; char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' }; char a2[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f', '\0' }; int numElems = 7; ASSERT_TRUE(removeElement(a1, numElems, numElems-1)); ASSERT_TRUE(numElems == 6); ASSERT_TRUE(std::equal(a1, a1+6, a2)); ``` **Explanation:** - **Purpose:** Checks if the `removeElement` function can remove the last element from `a1`. - **Assertions:** - The last element of `a1` should be removed. - `numElems` should be updated to `6`. - The modified `a1` should match the first six elements of `a2`. --- #### Test Case 3: ```cpp const int MAX_CHARS=20; char a1[MAX_CHARS] = { 'a', 'b', 'c', 'd', 'e', 'f',
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