C++ Exercises: Create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back

Last update on April 07 2025 12:57:02 (UTC/GMT +8 hours)

Add First 3 Characters to Front and Back

Write a C++ program to create a string taking the first 3 characters of a given string. Then, return the string with the 3 characters added to both the front and back. If the given string length is less than 3, use whatever characters are there.

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;

// Function to modify a string based on its length
string test(string str)
{
    if (str.length() < 3) // Check if the length of the string is less than 3
    {
        return str + str + str; // Return the concatenated string three times if its length is less than 3
    }
    else
    {
        string front = str.substr(0, 3); // Extract the first three characters of the string
        return front + str + front; // Concatenate the first three characters, the original string, and again the first three characters
    }
}

// Main function
int main() 
{
    cout << test("Python") << endl;  // Output the result of test function with string "Python"
    cout << test("JS") << endl;      // Output the result of test function with string "JS"
    cout << test("Code") << endl;    // Output the result of test function with string "Code"
    return 0;    // Return 0 to indicate successful execution of the program
}

Sample Output:

PytPythonPyt
JSJSJS
CodCodeCod

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to create a new string by appending the first three characters of a given string to both its beginning and end.
• Write a C++ program that takes a string input and, if its length is at least 3, duplicates its first three characters at both ends.
• Write a C++ program to read a string and output a modified version with the initial three characters added to the front and back.
• Write a C++ program that constructs a new string by surrounding the original string with its first three characters, handling short strings gracefully.

C++ Code Editor:

Click to Open Editor

Contribute your code and comments through Disqus.

Previous: Write a C++ program to check if a given positive number is a multiple of 3 or a multiple of 7.
Next: Write a C++ program to check if a given string starts with 'C#' or not.