Listing Odd Numbers Using C++
This tutorial explains how to list odd numbers using C++ in a simple and beginner-friendly way. It is designed for students and learners who are new to programming and want to understand how odd numbers can be generated using basic C++ logic.
By the end of this lesson, you will know how to generate odd numbers in C++, use loops effectively, and apply simple conditions to filter numbers.
What Are Odd Numbers? | Maths Explanation for C++ Kids
Odd numbers are whole numbers that are not divisible by 2. Examples include 1, 3, 5, 7, and 9. In mathematics, an odd number always leaves a remainder of 1 when divided by 2.
Understanding odd numbers is an important part of primary mathematics, and C++ provides a practical way to explore this concept using code.
How to Generate Odd Numbers in C++
To generate odd numbers in C++, we use a loop to go through a range of numbers and a condition to check whether each number is odd.
A number is considered odd if:
number % 2 !== 0
This condition checks whether the remainder after dividing by 2 is not zero.
C++ Odd Number Program (Beginner Example)
The following example shows a simple C++ odd number program. It lists odd numbers within a given range and displays them on the page.
This type of example is commonly used in C++ beginner tutorials and helps students learn both maths concepts and programming basics at the same time.
Create a new C++ Class file;
Call it OddNumbers.
Type out the adjoining C++ code for listing odd numbers.
Code for Odd Number List with User Input in C++
For a little more flexibility, let's add an input form to our C++ code for odd numbers.
All we need is a way to ask the user for input to limit the range of odd numbers.
For this purpose, we'll use the getline() and cin
objects from the C++ libraries.
Using a Loop to Display Odd Numbers in C++
A loop allows C++ to repeat an action multiple times. In this case, the loop checks each number in a range and displays only the odd ones.
This approach demonstrates:
- How to use a loop in C++
- How to apply conditions
- How to list odd numbers with C++ clearly and efficiently
It is an excellent example for learners studying C++ maths code for the first time.
We have used a function here.
A function is a chunk of code that is executed when it is called upon,
such as when an event occurs.
Why Learn Odd Numbers with C++?
Learning how to work with odd numbers in C++ helps students to:
- Understand number patterns
- Practice logical thinking
- Learn basic programming structures
- Combine primary maths with coding skills
This makes C++ a useful tool for teaching and reinforcing mathematical concepts in an interactive way.
Who Is This C++ Lesson For?
This C++ lesson is suitable for:
- Primary school students
- Beginners learning C++
- Teachers looking for simple coding examples
- Anyone learning how to generate odd numbers in C++
No prior C++ programming experience is required.
Key Takeaways from Listing Odd Numbers Using C++
- Odd numbers are numbers not divisible by 2
- C++ can be used to generate and display odd numbers
- Loops and conditions are essential programming tools
- This tutorial provides a clear C++ odd numbers tutorial for beginners
Summary: Listing Odd Numbers Using C++
Learning how to generate odd numbers in C++ is a fun and practical way to combine math and coding. Whether you're a teacher, parent, or student, these C++ tutorials for kids make programming approachable and engaging.
So! C++ Fun Practice Exercise - List Odd Numbers
As a fun practice exercise, feel free to try out your own boundary values, and see how the C++ code lists the odd numbers between those boundary values.
C++ Code for Odd Numbers - Header File.
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
class OddNumbers {
public:
OddNumbers(unsigned, unsigned);
virtual ~OddNumbers();
string prepResult();
private:
unsigned int start; // Our starting point
unsigned int stop; // where we will stop
string result; // Store result here.
stringstream aux; // helps us convert int to string
};
C++ Code for Odd Numbers - Class File.
#include "OddNumbers.h"
/**
* Our constructor.
* @param first - for the start value
* @param last - for the end value
*/
OddNumbers::OddNumbers(unsigned first, unsigned last) {
start = first;
stop = last;
aux << first;
result = "Odd numbers between " + aux.str();
aux.str(""); // clear 'aux'
aux << last;
result += " and " + aux.str() + " are: \n";
aux.str("");
}
/**
* nitty gritty
* @return - list of the required even numbers.
*/
string OddNumbers::prepResult() {
/*
* Loop from start to stop and rip out odd numbers;
*/
while (start <= stop) {
if ((start % 2) != 0) { // modulo(%) is explained below
aux << start;
result += aux.str() + "; "; // Mind the '+' in front of the '='
aux.str("");
}
start++; // increase start by 1(same as start = start + 1
}
return result;
}
OddNumbers::~OddNumbers() {
}
C++ Code for Odd Numbers - Main class.
//
#include "stdafx.h"
#include "OddNumbers.h"
#include <iostream>
using namespace std;
int main() {
try {
cout << "\n Welcome to our demonstration sequels\n";
cout << "Hope you enjoy (and follow) the lessons.\n\n";
unsigned int start = 1, stop = 100;
/*
* Use the odd number class.
*/
OddNumbers o_list(start, stop); // using start and stop values as from before
cout << "\n\n" << o_list.prepResult() << "\n";
} catch (exception& e) {
cout << "\n" << e.what() << "\n";
}
return 0;
}
C++ Code for Odd Numbers - Main class for Collecting Input.
//
#include "stdafx.h"
#include "OddNumbers.h"
#include <iostream>
#include <sstream>
using namespace std;
int main() {
try {
cout << "\n Welcome to our demonstration sequels\n";
cout << "Hope you enjoy (and follow) the lessons.\n\n";
unsigned int start = 1, stop = 100;
/*
* Collect Input
*/
string user_str;
cout << "\n\n" << "Enter the range for your odd numbers.\n";
cout << "Enter Start Number: ";
getline(cin, user_str); // Used for collecting user input.
stringstream(user_str) >> start;
cout << "Enter Stop Number: ";
getline(cin, user_str);
stringstream(user_str) >> stop;
OddNumbers io_list(start, stop);
cout << "\n" << io_list.prepResult() << "\n";
} catch (exception& e) {
cout << "\n" << e.what() << "\n";
}
return 0;
}