﻿ C++ : New array swapping first, last elements of an array

# C++ Exercises: Create a new array swapping the first and last elements of a given array of integers and length will be least 1

## C++ Basic Algorithm: Exercise-95 with Solution

Write a C++ program to create an array by swapping the first and last elements of a given array of integers with a length of at least 1.

Sample Solution:

C++ Code :

``````#include <iostream>
using namespace std;

static int *test(int numbers[], int arr_length)
{
int first = numbers[0];
numbers[0] = numbers[arr_length - 1];
numbers[arr_length - 1] = first;

return numbers;
}

int main () {
int *p, i;
int nums1[] = { 1, 5, 7, 9, 11, 13 };
cout << "Original array:" << endl;
int arr_length = sizeof(nums1) / sizeof(nums1[0]);
for ( i = 0; i < arr_length; i++ ) {
cout << nums1[i] << " ";
}
p =  test(nums1, arr_length);
cout << "\nNew array (after swapping the first and last elements of the said array): " << endl;
for ( i = 0; i < arr_length; i++ ) {
cout << *(p + i) << " ";
}
return 0;
}
``````

Sample Output:

```Original array:
1 5 7 9 11 13
New array (after swapping the first and last elements of the said array):
13 5 7 9 11 1
```

Pictorial Presentation:

Flowchart:

C++ Code Editor:

What is the difficulty level of this exercise?

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## C++ Programming: Tips of the Day

What is the "-->" operator in C/C++?

--> is not an operator. It is in fact two separate operators, -- and >.

The conditional's code decrements x, while returning x's original (not decremented) value, and then compares the original value with 0 using the > operator.

To better understand, the statement could be written as follows:

while( (x--) > 0 )

Ref : https://bit.ly/3kOTBby

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