C++ Exercises: Create a new string from a given string

Last update on August 13 2025 12:46:56 (UTC/GMT +8 hours)

Remove First Two Characters if Start = End

Write a C++ program to create a new string from a string. Return the given string without the first two characters if the two characters at the beginning and end are the same. 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 checks the first and last two characters of the input string and modifies it accordingly
string test(string s1)
{
    // Check if the length of s1 is greater than 1 and the first two characters are equal to the last two characters
    if (s1.length() > 1 && s1.substr(0, 2) == s1.substr(s1.length() - 2))
    {
        return s1.substr(2); // Return a substring of s1 starting from index 2
    }
    else
    {
        return s1; // Return s1 unchanged if the condition is not met
    }
}

// Main function
int main() 
{
    cout << test("abcab") << endl;   // Output for "abcab"
    cout << test("Python") << endl;  // Output for "Python"
    cout << test("abcabab") << endl; // Output for "abcabab"
    return 0;    // Return statement indicating successful termination of the program
}

Sample Output:

cab
Python
cabab

Visual Presentation:

C++ Basic Algorithm Exercises: Create a new string from a given string.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program that removes the first two characters from a string if they are identical to the last two characters; otherwise, return the original string.
Write a C++ program to check whether the beginning and ending of a string match; if so, remove the first two characters and print the modified string.
Write a C++ program that reads a string and deletes its first two characters if these match its final two characters, otherwise outputs the unchanged string.
Write a C++ program to compare the first two and last two characters of a string, removing the leading pair if they are the same.

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