C++ Exercises: Create a new string of length 2, using first two characters of a given string

C++ Basic Algorithm: Exercise-71 with Solution

Write a C++ program to create a new string of length 2, using the first two characters of a given string. If the given string length is less than 2 use '#' as missing characters.

Sample Solution:

C++ Code :

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

using namespace std; // Using the standard namespace

// Function that manipulates the input string based on its length
string test(string s1)
{
    // Check if the length of the string is greater than or equal to 2
    if (s1.length() >= 2)
    {
        s1 = s1.substr(0, 2); // Take the first two characters of s1
    }
    // If the length of the string is greater than 0 and less than 2
    else if (s1.length() > 0)
    {
        s1 = s1.substr(0, 1) + "#"; // Take the first character of s1 and append '#' to it
    }
    else // If the string is empty
    {
        s1 = "##"; // Assign "##" to s1
    }

    return s1; // Return the modified string
}

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

Sample Output:

He
Py
a#
##

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