C++ Exercises: Check if the first appearance of 'a' in a given string is immediately followed by another 'a'

Last update on December 20 2024 12:28:07 (UTC/GMT +8 hours)

Check 'aa' Immediately After First 'a'

Write a C++ program to check if the first appearance of "a" in a given string is immediately followed by another "a".

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;

// Function to check if the string contains "aa" not more than twice and 'a' character(s)
bool test(string str)
{
    int counter = 0; // Counter to track occurrences of 'a'

    // Loop through the string 'str' up to the second-to-last character
    for (int i = 0; i < str.length() - 1; i++)
    {
        if (str[i] == 'a') // Check if the character at index 'i' is 'a'
            counter++; // Increment the 'a' counter

        // Check for occurrences of "aa" and ensure 'a' count is less than 2
        if (str.substr(i, 2) == "aa" && counter < 2)
            return true; // Return true if "aa" occurs and 'a' count is less than 2
    }

    return false; // Return false if the conditions are not met
}

// Main function
int main() 
{
    // Output the results of test function with different input strings
    cout << test("caabb") << endl;
    cout << test("babaaba") << endl;
    cout << test("aaaaa") << endl;

    return 0; // Return 0 to indicate successful completion
}

Sample Output:

1
0
1

Visual Presentation:

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