C++ Exercises: Create a new string taking the first character from a given string and the last character from another given string

Last update on April 07 2025 12:57:52 (UTC/GMT +8 hours)

First and Last Character from Two Strings

Write a C++ program to create a string taking the first character from a string and the last character from another given string. If the length of any given string is 0, use '#' as its missing character.

Sample Solution:

C++ Code :

#include <iostream> // Including the input/output stream library

using namespace std; // Using the standard namespace

// Function that constructs a string based on the first and last characters of two input strings
string test(string s1, string s2)
{
    string lastChars = ""; // Initialize an empty string to store the constructed string

    // Check if s1 has at least one character
    if (s1.length() > 0)
    {
        lastChars += s1.substr(0, 1); // Append the first character of s1 to lastChars
    }
    else
    {
        lastChars += "#"; // If s1 is empty, append '#' to lastChars
    }

    // Check if s2 has at least one character
    if (s2.length() > 0)
    {
        lastChars += s2.substr(s2.length() - 1); // Append the last character of s2 to lastChars
    }
    else
    {
        lastChars += "#"; // If s2 is empty, append '#' to lastChars
    }

    return lastChars; // Return the constructed string containing first character from s1 and last character from s2 (or '#' if any string is empty)
}

// Main function
int main() 
{
    cout << test("Hello", "Hi") << endl;    // Output the result of test function with "Hello" and "Hi"
    cout << test("Python", "PHP") << endl;  // Output the result of test function with "Python" and "PHP"
    cout << test("JS", "JS") << endl;       // Output the result of test function with "JS" and "JS"
    cout << test("Csharp", "") << endl;    // Output the result of test function with "Csharp" and an empty string
    return 0;    // Return statement indicating successful termination of the program
}

Sample Output:

Hi
PP
JS
C#

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program that takes two strings and forms a new string by concatenating the first character of the first string and the last character of the second string; use '#' if any string is empty.
• Write a C++ program to read two inputs and output a combined string consisting of the first letter of the first input and the final letter of the second input, substituting '#' for any missing character.
• Write a C++ program that creates a string by merging the first character from one string and the last character from another; if either string is empty, use '#' in its place.
• Write a C++ program to combine the edge characters of two input strings into a new string, ensuring that empty inputs are replaced by '#'.

C++ Code Editor:

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