How do I generate a random integer in C#?

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Post author: Adam VanBuskirk
Adam VanBuskirk
6/3/23 in
Tech
C#

In C#, you can generate a random integer using the Random class. Here are three examples that demonstrate different ways to generate random integers:

Generating a random integer within a specified range

Random random = new Random();
int randomNumber = random.Next(1, 100); // Generates a random integer between 1 and 100
Console.WriteLine(randomNumber);

In this example, we create an instance of the Random class called random. By calling the Next method on the random object and specifying the range (1, 100), we generate a random integer between 1 and 100 (inclusive). The generated integer is stored in the variable randomNumber, and then it is printed to the console.

Generating a random integer within a specified range, including zero

Random random = new Random();
int randomNumber = random.Next(100); // Generates a random integer between 0 and 100
Console.WriteLine(randomNumber);

This example is similar to the previous one, but we don’t pass a lower bound to the Next() function, so zero is also included in the possible range of numbers.

Generating a random integer without specifying a range

Random random = new Random();
int randomNumber = random.Next(); // Generates a random integer within the full range of int
Console.WriteLine(randomNumber);

In this example, we don’t specify a range for the Next method, so it generates a random integer within the full range of int. The int data type in C# has a range from -2,147,483,648 to 2,147,483,647. The generated random integer is stored in the variable randomNumber and then printed to the console.

Note: It’s important to create only one instance of the Random class and reuse it multiple times to avoid repeating the same sequence of random numbers. If you create multiple instances of Random in a short period, they might produce the same sequence because they are initialized with the same seed value.

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