C++ String Exercises: Select lowercase characters from the other string

C++ String: Exercise-40 with Solution

For two given strings, str1 and str2, write a C++ program to select only the characters that are lowercase in the other string at the same position. Return characters as a single string.

Test Data:
("Java", "jscript") -> "scr"
("jScript", "Java") -> "Jva"
("cpp", "c++") -> "c++"

Sample Solution:

C++ Code:

#include <bits/stdc++.h> // Include all standard libraries

using namespace std; // Using the standard namespace

// Function to concatenate characters at the same index if one string contains lowercase characters and the other doesn't
std::string test(std::string str1, std::string str2) {
    int str_size;
    // Determine the smaller size between the two input strings
    str1.size() < str2.size() ? str_size = str1.size() : str_size = str2.size();

    std::string s1 = ""; // Initialize an empty string s1
    std::string s2 = ""; // Initialize an empty string s2
    std::string result = ""; // Initialize an empty string result to store the final concatenated string

    // Iterate through the strings up to the determined size
    for (int i = 0; i < str_size; i++) {
        if (str1[i] >= 'a' && str1[i] <= 'z') // Check if str1 has a lowercase character
            s2.push_back(str2[i]); // Add the character from str2 to s2 at the same index

        if (str2[i] >= 'z' && str2[i] <= 'z') // Check if str2 has a lowercase character
            s1.push_back(str1[i]); // Add the character from str1 to s1 at the same index
    }

    result = s1 + s2; // Concatenate s1 and s2 to form the final result
    return result; // Return the concatenated string
}

int main() {
    // Test cases
    string str1 = "Java";
    string str2 = "jscript";
    cout << "Strings: " << str1 << " " << str2;
    cout << "\nCheck said string contains lowercase characters! " << test(str1, str2) << endl;

    str1 = "jScript";
    str2 = "Java";
    cout << "Strings: " << str1 << " " << str2;
    cout << "\nCheck said string contains lowercase characters! " << test(str1, str2) << endl;

    str1 = "cpp";
    str2 = "c++";
    cout << "Strings: " << str1 << " " << str2;
    cout << "\nCheck said string contains lowercase characters! " << test(str1, str2) << endl;
}

Sample Output:

Strings: Java jscript
Check said string contains lowercase characters! scr
Strings: jScript Java
Check said string contains lowercase characters! Jva
Strings: cpp c++
Check said string contains lowercase characters! c++

Flowchart:

C++ Code Editor:

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