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C# program to find largest of three numbers

Learn, how to find largest number among three numbers using the simple if-else statement and ternary operator in C#?
Submitted by IncludeHelp, on April 09, 2019 [Last updated : March 18, 2023]

Given three integer numbers and we have to find largest number using C# program.

Finding largest of three numbers

To find the largest number from given three numbers – we will compare their values using either the simple if-else statement or ternary operator. If the first number is greater than the second number and third number, assign the first number to the variable in which we will store the largest number, if the second number is greater than the second number and the third number then assign the second number to the variable, else assign the third number to the variable.

Let suppose given numbers are a, b and c and we have to store the largest number in large.

Using if-else

        if (a > b && a > c)
            large = a;
        else if (b > a && b > c)
            large = b;
        else
            large = c;

Using ternary operator

large = (a > b && a > c) ? a : (b > a && b > c) ? b : c;

C# code to find largest of three numbers

Here, we are asking for three integer numbers from the user and finding the largest one using if-else and ternary operator.

// C# program to find largest of three numbers 

using System;
using System.IO;
using System.Text;

namespace IncludeHelp {
  class Test {
    // Main Method 
    static void Main(string[] args) {
      int a;
      int b;
      int c;
      int large;

      //input the numbers
      Console.Write("Enter first number : ");
      a = Convert.ToInt32(Console.ReadLine());
      Console.Write("Enter second number: ");
      b = Convert.ToInt32(Console.ReadLine());
      Console.Write("Enter third number : ");
      c = Convert.ToInt32(Console.ReadLine());

      //finding largest number using if-else
      if (a > b && a > c)
        large = a;
      else if (b > a && b > c)
        large = b;
      else large = c;

      //printing 
      Console.WriteLine("Using if-else...");
      Console.WriteLine("Largest number is {0}", large);

      //finding largest number using ternary operator 
      large = (a > b && a > c) ? a : (b > a && b > c) ? b : c;

      //printing 
      Console.WriteLine("Using ternary operator...");
      Console.WriteLine("Largest number is {0}", large);

      //hit ENTER to exit the program
      Console.ReadLine();
    }
  }
}

Output

First run:
Enter first number : 10
Enter second number: 20
Enter third number : 30
Using if-else...
Largest number is 30
Using ternary operator...
Largest number is 30

Second run:
Enter first number : 10
Enter second number: 30
Enter third number : 20
Using if-else...
Largest number is 30
Using ternary operator...
Largest number is 30

Third run:
Enter first number : 30
Enter second number: 20
Enter third number : 10
Using if-else...
Largest number is 30
Using ternary operator...
Largest number is 30

Fourth run:
Enter first number : 10
Enter second number: 20
Enter third number : 20
Using if-else...
Largest number is 20
Using ternary operator...
Largest number is 20

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