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Finding the Greatest of Three Numbers in C#

This exercise demonstrates how to use conditional statements in C# to compare three numbers and find the greatest one. The program will prompt the user to input three different numbers and then determine which one is the largest. By using if and else if statements, we can check each pair of numbers and compare them effectively.

This type of logic is commonly used in scenarios where a program needs to make decisions based on user input, such as determining the highest score in a game or selecting the best option from a set of choices. This exercise will help you understand how to use comparison operators and conditional statements in C# to solve such problems.



Group

C# Flow Control Basics

Objective

The objective of this exercise is to write a C# program that asks the user to input three numbers and then compares them to find and display the greatest one.

Write a C# program that prompts the user to enter three numbers and displays the greatest one.

Example C# Exercise

 Copy C# Code 
// First and Last Name: John Doe

using System;

namespace GreatestOfThreeNumbers
{
    class Program
    {
        // Main method to start the program execution
        static void Main(string[] args)
        {
            // Declare three variables to store the user's input
            double num1, num2, num3;

            // Prompt the user to enter the first number
            Console.Write("Enter the first number: ");
            num1 = Convert.ToDouble(Console.ReadLine()); // Read input and convert to double

            // Prompt the user to enter the second number
            Console.Write("Enter the second number: ");
            num2 = Convert.ToDouble(Console.ReadLine()); // Read input and convert to double

            // Prompt the user to enter the third number
            Console.Write("Enter the third number: ");
            num3 = Convert.ToDouble(Console.ReadLine()); // Read input and convert to double

            // Compare the three numbers and display the greatest one
            if (num1 >= num2 && num1 >= num3)
            {
                // num1 is greater than or equal to both num2 and num3
                Console.WriteLine("The greatest number is: " + num1);
            }
            else if (num2 >= num1 && num2 >= num3)
            {
                // num2 is greater than or equal to both num1 and num3
                Console.WriteLine("The greatest number is: " + num2);
            }
            else
            {
                // num3 is the greatest number
                Console.WriteLine("The greatest number is: " + num3);
            }

            // Wait for user input before closing the console window
            Console.ReadKey(); // Keeps the console open until a key is pressed
        }
    }
}

 Output

//Example 1 (num1 is greatest):
Enter the first number: 7  
Enter the second number: 3  
Enter the third number: 5  
The greatest number is: 7  

//Example 2 (num2 is greatest):
Enter the first number: 4  
Enter the second number: 9  
Enter the third number: 2  
The greatest number is: 9  

//Example 3 (num3 is greatest):
Enter the first number: 2  
Enter the second number: 3  
Enter the third number: 10  
The greatest number is: 10

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More C# Practice Exercises of C# Flow Control Basics

Explore our set of C# Practice Exercises! Specifically designed for beginners, these exercises will help you develop a solid understanding of the basics of C#. From variables and data types to control structures and simple functions, each exercise is crafted to challenge you incrementally as you build confidence in coding in C#.