C++ Exercises: Exchange the first and last characters in a given string and return the new string

Last update on April 07 2025 12:58:21 (UTC/GMT +8 hours)

Swap First and Last Characters

Write a C++ program to exchange the first and last characters in a given string and return the result 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 greater than 1
    return str.length() > 1
        ? str.substr(str.length() - 1) + str.substr(1, str.length() - 2) + str.substr(0, 1) // Rearrange the string by moving the first character to the end
        : str; // Return the string as it is if its length is 1 or less
}

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

Sample Output:

dbca
a
yx

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program that exchanges the first and last characters of a string and outputs the resulting string.
• Write a C++ program to swap the first and last letters of an input string, handling edge cases for strings of length one.
• Write a C++ program that reads a string and interchanges its first and last characters before printing the modified string.
• Write a C++ program that takes a string input and, using pointer manipulation, swaps its first and last characters.

C++ Code Editor:

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Next: Write a C++ program to create a new string which 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.