Output Numbers from 1 to 10 in CSharp

Output Numbers from 1 to 10 in C#

Introduction

In programming, one of the most common tasks is displaying a sequence of values. Whether it’s listing items, printing steps in order, or generating numbers, knowing how to output data in sequence is very important. In this lesson, we will learn how to display numbers from 1 to 10 using C#. This activity will help you understand how loops and program flow work, while also giving you confidence in writing simple, structured code. By practicing this, you will take another step forward in learning how computers repeat tasks efficiently and avoid repetitive coding.

Objectives

This lesson builds a strong habit of writing small, working programs. Your goal is to understand what the code does, learn the syntax for loops, practice by running and tweaking a sample program, and finally apply the idea by extending it to simple real‑world style tasks (like printing ranges or even numbers).

• Understand: Explain how a loop (for/while) works to print numbers in sequence.
• Learn: Identify and write the correct C# syntax for a for loop that counts from 1 to 10.
• Practice: Build and run a C# console app in VS Code that outputs numbers 1–10.
• Apply: Modify the program to print custom ranges or only even/odd numbers.

Beginner-Friendly Source Code & Step-by-Step Instructions

1. Open VS Code. Make sure the .NET SDK is installed (dotnet –version in Terminal should show a number).
2. Create/open your course folder (e.g., D:\2025-1_doe_bsis_1a).
3. Open the folder in VS Code (File → Open Folder…).
4. Open a new Terminal in VS Code (Terminal → New Terminal).
5. Create a console project:
   dotnet new console -n output_1_to_10
6. Change directory into the project:
   cd output_1_to_10
7. Open Program.cs and replace its contents with the code below.
8. Run the app:
   dotnet run

Program.cs

using System;

namespace NumbersOutputApp

{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Numbers from 1 to 10:");

            Console.WriteLine(1);
            Console.WriteLine(2);
            Console.WriteLine(3);
            Console.WriteLine(4);
            Console.WriteLine(5);
            Console.WriteLine(6);
            Console.WriteLine(7);
            Console.WriteLine(8);
            Console.WriteLine(9);
            Console.WriteLine(10);
        }
    }
}

1
2
3
4
5
6
7
8
9
10

Explanation of the Program

This simple program demonstrates how to display numbers from 1 to 10 using Console.WriteLine in C#. The program begins by importing the System namespace, which allows us to use built-in methods like Console.WriteLine. We then define a namespace (NumbersOutputApp) and a class (Program), which are required structures in C# to organize our code.

Inside the Main method, which is the starting point of every C# application, we first display a short heading to inform the user about what the program will do. After that, we print the numbers 1 through 10 one by one, without using loops. Each number is written as a separate Console.WriteLine statement.

The purpose of this exercise is to help beginners become familiar with the basic structure of a C# program and the use of Console.WriteLine for output. Although this approach is not efficient for larger tasks, it introduces the concept of outputting values to the console in the simplest way possible, before moving on to more advanced topics like loops.

Summary

In this lesson, you learned how to display numbers from 1 to 10 in C# without using loops. By writing multiple Console.WriteLine() statements, you can control exactly what the program outputs. While this method works for small tasks, you will later see how loops make this process easier and more efficient.

Quiz

1. Which command is used to display output in C#?
   A. Console.ReadLine()
   B. Console.WriteLine() 
   C. Console.Input()
   D. Console.Print()

2. What is the correct way to display the number 5?
   A. Console.WriteLine(“5”); 
   B. Console.Print(5);
   C. WriteLine.Console(5);
   D. System.Out(5);

3. If you want to output numbers 1–10 without a loop, what must you do?
   A. Use a while loop
   B. Use multiple Console.WriteLine() statements 
   C. Use Console.PrintAll()
   D. It’s not possible in C#

4. What will happen if you forget to write Console.WriteLine(10); in the program?
   A. Error occurs
   B. Only numbers 1–9 are displayed 
   C. Nothing displays
   D. Program won’t run at all

5. Why is this approach (without loops) not recommended for larger sequences?
   A. It makes code too repetitive and hard to maintain 
   B. It produces errors
   C. It requires user input
   D. It doesn’t display output

Exercises and Assessment

Intro

To strengthen your understanding of Console.WriteLine(), here are exercises that will challenge you to modify and expand the code. These activities will prepare you for loop-based programming later.

Exercises

1. Modify the program to output numbers from 1 to 20.

2. Change the program to output even numbers only (2, 4, 6, … 20).

3. Display your name followed by your age and hobby after printing the numbers.

4. Write a program that outputs numbers in reverse (10 to 1).

5. Create a program that displays a sequence of 5 favorite numbers.

Assessment

• Quiz: Answer the 5 multiple-choice questions.

• Performance Task: Modify the code to print numbers from 50 to 60.

Lab Exam

• Write a program in C# that prints numbers from 1 to 15 without using loops.

• Output must show each number on a separate line.

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