C++ Exercises: Check a given array of integers and return true if there is a 3 with a 5 somewhere later in the given array

Last update on December 20 2024 12:27:49 (UTC/GMT +8 hours)

Check if '3' is Followed by '5' in Array

Write a C++ program to check a given array of integers and return true if there is a 3 with a 5 somewhere later in the given array.

Sample Solution:

C++ Code :

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

using namespace std;  // Using standard namespace

// Function definition that checks for the occurrence of '5' following '3' in the array
static bool test(int nums[], int arr_length)
{
    bool three = false;  // Initializing a boolean variable 'three' to keep track of '3' occurrence

    // Loop through the array elements to find a '5' following '3'
    for (int i = 0; i < arr_length; i++)
    {
        // If 'three' is true (meaning '3' was previously encountered) and current element is '5', return true
        if (three && nums[i] == 5) return true;

        // If current element is '3', set 'three' to true to track its occurrence
        if (nums[i] == 3) three = true;
    }

    return false;  // Return false if '5' following '3' is not found in the array
}

int main() 
{  
    int nums1[] = {3, 5, 1, 3, 7};  // Initializing array nums1 with '5' following '3'
    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 '5' following '3'
    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 '5' following '3'
    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[] = {2, 5, 5, 7, 8, 10};  // Initializing array nums4 with no '5' following '3'
    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
0

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