C++ Exercises: Check a given array of integers and return true if the given array contains two 5's next to each other, or two 5 separated by one element

Last update on December 20 2024 12:21:22 (UTC/GMT +8 hours)

Check if Array Contains Two '5's Next or Separated by One Element

Write a C++ program to check a given array of integers. Then, return true if the given array contains two 5's next to each other, or two 5's separated by one element.

Sample Solution:

C++ Code :

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

using namespace std;  // Using standard namespace

// Function definition that checks for the presence of '5' twice consecutively in the array
static bool test(int nums[], int arr_length)
{
    int len = arr_length;  // Storing the length of the array in 'len'

    // Loop through the array elements to check for specific '5' patterns
    for (int i = 0; i < len - 1; i++)
    {
        // Checking if '5' appears twice consecutively at i and i+1 indices
        if (nums[i] == 5 && nums[i + 1] == 5) return true;

        // Checking if '5' appears twice consecutively but with one element in between
        if (i + 2 < len && nums[i] == 5 && nums[i + 2] == 5) return true;
    }

    return false;  // Returning false if the specified '5' patterns are not found
}

int main() 
{  
    int nums1[] = {5, 5, 1, 5, 5};  // Initializing array nums1 with specific '5' patterns
    int arr_length = sizeof(nums1) / sizeof(nums1[0]);  // Calculating length of array nums1

    // Calling test function with nums1 and displaying the result (true or false)
    cout << test(nums1, arr_length) << endl; 

    int nums2[] = {1, 2, 3, 4};  // Initializing array nums2 with no specific '5' patterns
    arr_length = sizeof(nums2) / sizeof(nums2[0]);  // Calculating length of array nums2

    // Calling test function with nums2 and displaying the result (true or false)
    cout << test(nums2, arr_length) << endl;

    int nums3[] = {3, 3, 5, 5, 5, 5};  // Initializing array nums3 with specific '5' patterns
    arr_length = sizeof(nums3) / sizeof(nums3[0]);  // Calculating length of array nums3

    // Calling test function with nums3 and displaying the result (true or false)
    cout << test(nums3, arr_length) << endl;

    int nums4[] = {1, 5, 5, 7, 8, 10};  // Initializing array nums4 with no specific '5' patterns
    arr_length = sizeof(nums4) / sizeof(nums4[0]);  // Calculating length of array nums4

    // Calling test function with nums4 and displaying the result (true or false)
    cout << test(nums4, arr_length) << endl;

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

Sample Output:

1
0
1
1

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