C++ Exercises: Create a new string which is 4 copies of the 2 front characters of a given string

Last update on April 07 2025 12:58:20 (UTC/GMT +8 hours)

4 Copies of First 2 Characters

Write a C++ program to create a string that is 4 copies of the 2 front characters of a given string. If the given string length is less than 2 return the original string.

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;

// Function to modify a string based on certain conditions
string test(string str)
{
    // Check if the length of the string is less than 2
    return str.length() < 2 ? str : // If the length is less than 2, return the string as it is
        str.substr(0, 2) + str.substr(0, 2) + str.substr(0, 2) + str.substr(0, 2); // If the length is 2 or more, concatenate the first two characters of the string four times
}

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

Sample Output:

C C C C
JSJSJSJS
a

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to generate a new string that is 4 copies of the first two characters of a given string; if the string length is less than 2, return the original string.
• Write a C++ program that takes a string input and concatenates 4 copies of its first two characters to form a new string.
• Write a C++ program to replicate the first two characters of a string four times and print the result, handling short strings appropriately.
• Write a C++ program that checks the length of a string and, if it is at least 2, constructs a new string with 4 repetitions of its first two characters.

C++ Code Editor:

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