C++ Exercises: Create a new string from a given string. If the first or first two characters is 'a', return the string without those 'a' characters otherwise return the original given string

Last update on August 13 2025 12:46:57 (UTC/GMT +8 hours)

Remove First/First Two 'a's if Present

Write a C++ program to create a new string from a given string. If the first or first two characters are 'a', return the string without those 'a' characters, otherwise return the original string.

Sample Solution:

C++ Code :

#include <iostream> // Including the input/output stream library
using namespace std; // Using the standard namespace

// Function that removes 'a' from specific positions within the input string
string test(string s1)
{
    // Check if the length of s1 is 1 and the only character is 'a'
    if (s1.length() == 1 && s1.substr(0, 1) == "a")
    {
        s1 = s1.erase(0, 1); // Remove the only character from s1
    }

    // Check if the length of s1 is greater than 1
    if (s1.length() > 1)
    {
        // Check if the second character of s1 is 'a'
        if (s1.substr(1, 1) == "a")
        {
            s1 = s1.erase(1, 1); // Remove the second character from s1
        }

        // Check if the first character of s1 is 'a'
        if (s1.substr(0, 1) == "a")
        {
            s1 = s1.erase(0, 1); // Remove the first character from s1
        }
    }

    return s1; // Return the modified string
}

// Main function
int main() 
{
    cout << test("abcab") << endl;
    cout << test("python") << endl;
    cout << test("aacda") << endl; 
    cout << test("jython") << endl;
    return 0;    // Return statement indicating successful termination of the program
}

Sample Output:

bcab
python
cda
jython

Visual Presentation:

C++ Basic Algorithm Exercises: Create a new string from a given string. If the first or first two characters is 'a', return the string without those 'a' characters otherwise return the original given string.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program that removes one or two leading 'a' characters from a string if they are present; otherwise, it returns the original string.
Write a C++ program to check the beginning of a string for 'a' or "aa" and remove those characters, printing the modified result.
Write a C++ program that reads a string and strips out the initial 'a's (up to two) if found, otherwise leaving the string intact.
Write a C++ program to process a string by removing the first one or two characters if they are 'a', and then output the result.

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