C++ String Exercises: Insert a dash between two odd numbers in a string

Last update on December 20 2024 12:32:13 (UTC/GMT +8 hours)

Write a C++ program to insert a dash character (-) between two odd numbers in a given string of numbers.

Visual Presentation:

Sample Solution:

C++ Code :

#include <iostream> // Including input/output stream library
#include <string> // Including string library for string operations

using namespace std; // Using the standard namespace

// Function to insert dashes between consecutive odd digits in a string of digits
string Insert_dash(string num_str) {

    string result_str = num_str; // Initializing a result string with the input number string

    // Loop through the characters in the string to find consecutive odd digits
    for (int x = 0; x < num_str.length() - 1; x++)
    {
        // Check if the current and the next characters are odd digits (1, 3, 5, 7, or 9)
        if ((num_str[x] == '1' || num_str[x] == '3' || num_str[x] == '5' || num_str[x] == '7' || num_str[x] == '9') &&
            (num_str[x + 1] == '1' || num_str[x + 1] == '3' || num_str[x + 1] == '5' || num_str[x + 1] == '7' || num_str[x + 1] == '9'))
        {
            // If consecutive odd digits are found, insert a dash between them
            result_str.insert(x + 1, "-");
            num_str = result_str; // Update the input string with the modified result string
        }
    }

    return result_str; // Return the modified number string with dashes
}

// Main function
int main() {

    // Output the original numbers and the numbers with dashes inserted between consecutive odd digits
    cout << "Original number-123456789 : Result-> " << Insert_dash("123456789") << endl;
    cout << "\nOriginal number-1345789 : Result-> " << Insert_dash("1345789") << endl;
    cout << "\nOriginal number-1345789 : Result-> " << Insert_dash("34635323928477") << endl;

    return 0; // Return 0 to indicate successful completion
}

Sample Output:

Original number-123456789 : Result-> 123456789

Original number-1345789 : Result-> 1-345-789

Original number-1345789 : Result-> 3463-5-323-92847-7

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