C++ Exercises: Create a new array length 3 from a given array the elements from the middle of the array

Last update on April 07 2025 12:56:23 (UTC/GMT +8 hours)

Create Array of Middle 3 Elements (Length ≥ 3)

Write a C++ program to create an array length 3 from a given array (length at least 3) using the elements from the middle of the array.

Sample Solution:

C++ Code :

#include <iostream>  // Including input-output stream header file

using namespace std;  // Using standard namespace

static int* test(int numbers[], int arr_length)  // Function definition that creates an array with three elements from the middle of the input array and returns a pointer to it
{          			
    static int result[] { numbers[arr_length / 2 - 1], numbers[arr_length / 2], numbers[arr_length / 2 + 1] };  // Creating a new array 'result' with three elements from the middle of the 'numbers' array
    return result;  // Returning a pointer to the newly created array
} 

int main() 
{  
    int *result, i;  // Declaring pointer variable result and integer i
    int nums[] = {1, 5, 7, 9, 11, 13};  // Initializing array nums with values  
    int arr_length = sizeof(nums) / sizeof(nums[0]);  // Calculating length of array nums

    cout << "Original array:" << endl;  // Printing a message

    for ( i = 0; i < arr_length; i++ )  // Loop to print elements of the nums array
        cout << nums[i] << " "; 
	
    result = test(nums, arr_length);  // Calling the test function and storing the returned pointer in result
    cout << "\nNew array:" << endl;   // Printing a message

    arr_length = sizeof(result) / sizeof(result[0]);  // Calculating the length of array pointed by result (This may not work as intended, see explanation below)

    for ( i = 0; i <= arr_length; i++ ) {  // Loop to print elements of the array pointed by result
        cout << *(result + i) << " ";  // Printing elements of the array pointed by result
    } 

    return 0;  // Returning 0 to indicate successful completion of the program
}

Sample Output:

Original array:
1 5 7 9 11 13 
New array:
7 9 11

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to extract three consecutive middle elements from an array (length at least 3) and create a new array with them.
• Write a C++ program that reads an array and, if its length is odd and at least 3, outputs an array consisting of its middle three elements.
• Write a C++ program to determine the central three elements of an array and form a new array with these values.
• Write a C++ program that accepts an array of integers and creates a subarray of length 3 from its center, then prints the subarray.

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