C#: Find the largest of three numbers

Last update on August 20 2025 12:38:17 (UTC/GMT +8 hours)

Write a C program to find the largest of three numbers.

C# Sharp: Find the largest of three numbers.

Sample Solution:-

C# Sharp Code:

using System;  // Importing the System namespace

public class Exercise8  // Declaration of the Exercise8 class
{  
    public static void Main()  // Entry point of the program
    {
        int num1, num2, num3;  // Declaration of integer variables num1, num2, and num3
        Console.Write("\n\n");  // Printing new lines
        Console.Write("Find the largest of three numbers:\n");  // Displaying the purpose of the program
        Console.Write("------------------------------------");  // Displaying a separator
        Console.Write("\n\n");  // Printing new lines

        Console.Write("Input the 1st number :");  // Prompting user to input the first number
        num1 = Convert.ToInt32(Console.ReadLine());  // Reading the input first number from the user

        Console.Write("Input the 2nd number :");  // Prompting user to input the second number
        num2 = Convert.ToInt32(Console.ReadLine());  // Reading the input second number from the user

        Console.Write("Input the 3rd number :");  // Prompting user to input the third number
        num3 = Convert.ToInt32(Console.ReadLine());  // Reading the input third number from the user

        if (num1 > num2)  // Checking if num1 is greater than num2
        {
            if (num1 > num3)  // Checking if num1 is greater than num3
            {
                Console.Write("The 1st Number is the greatest among three. \n\n");  // Printing a message if num1 is the greatest
            }
            else
            {
                Console.Write("The 3rd Number is the greatest among three. \n\n");  // Printing a message if num3 is the greatest
            }
        }
        else if (num2 > num3)  // Checking if num2 is greater than num3
        {
            Console.Write("The 2nd Number is the greatest among three \n\n");  // Printing a message if num2 is the greatest
        }
        else
        {
            Console.Write("The 3rd Number is the greatest among three \n\n");  // Printing a message if num3 is the greatest
        }
    }
}

Sample Output:

Find the largest of three numbers:                                                                            
------------------------------------                                                                                                  
Input the 1st number :20                                                                                      
Input the  2nd number :25                                                                                     
Input the 3rd  number :15                                                                                     
The 2nd Number is the greatest among three

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