C# | Random.Next() Method

The Next() Method of System.Random class in C# is used to get a random integer number. This method can be overloaded by passing different parameters to it as follows:

  • Next()
  • Next(Int32)
  • Next(Int32, Int32)

Next() Method

This method is used to returns a non-negative random integer.



Syntax:

public virtual int Next ();

Return Value: This method returns the 32-bit signed integer which is greater than or equal to 0 and less than MaxValue.

Example:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to illustrate the 
// Random.Next() Method
using System;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Instantiate random number generator
        Random rand = new Random();
  
        // Print 10 random numbers
        Console.WriteLine("Printing 10 random numbers");
        for (int i = 1; i <= 10; i++)
            Console.WriteLine("{0} -> {1}", i, rand.Next());
    }
}

chevron_right


Output:

Printing 10 random numbers
1 -> 1386420123
2 -> 2133003862
3 -> 981665925
4 -> 495382685
5 -> 1127976381
6 -> 824414652
7 -> 213006792
8 -> 1948108820
9 -> 214839986
10 -> 261560448

Next(Int32) Method

This method is used to get a non-negative random integer which is less than the specified maximum.

Syntax:

public virtual int Next (int maxValue);

Here, maxValue is the upper boundary of the random number to be generated. It must be greater than or equal to 0.

Return Value: The function returns a 32-bit signed integer which is greater than or equal to 0, and less than maxValue. However, if maxValue equals 0, maxValue is returned.

Exception: This method will give ArgumentOutOfRangeException if the maxValue is less than 0.

Example:


filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to illustrate the
// Random.Next(Int32) Method
using System;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Instantiate random number generator
        Random rand = new Random();
  
        // Print 10 random numbers less than 100
        Console.WriteLine("Printing 10 random numbers less than 100");
        for (int i = 1; i <= 10; i++)
            Console.WriteLine("{0} -> {1}", i, rand.Next(100));
    }
}

chevron_right


Output:

Printing 10 random numbers less than 100
1 -> 19
2 -> 94
3 -> 14
4 -> 54
5 -> 94
6 -> 73
7 -> 39
8 -> 42
9 -> 18
10 -> 77

Next(Int32, Int32) Method

This method is used to get the random integer that is within a specified range.

Syntax:

public virtual int Next (int minValue, int maxValue);

Parameters:

  • maxValue: It is the exclusive upper boundary of the random number generated. It must be greater than or equal to minValue.
  • minValue: It is the inclusive lower bound of the random number returned.

Return Value: The function returns a 32-bit signed integer greater than or equal to minValue and less than maxValue; that is, the range of return values includes minValue but not maxValue. If minValue equals maxValue, minValue is returned.

Exception: This method will give the ArgumentOutOfRangeException if the minValue is greater than maxValue.

Example:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to illustrate the
// Next(Int32, Int32) Method
using System;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Instantiate random number generator
        Random rand = new Random();
  
        // Print 10 random numbers between 50 and 100
        Console.WriteLine("Printing 10 random numbers"+
                                " between 50 and 100");
        for (int i = 1; i <= 10; i++)
            Console.WriteLine("{0} -> {1}", i, rand.Next(50, 100));
    }
}

chevron_right


Output:

Printing 10 random numbers between 50 and 100
1 -> 91
2 -> 85
3 -> 93
4 -> 74
5 -> 88
6 -> 77
7 -> 92
8 -> 76
9 -> 77
10 -> 52

Reference:



My Personal Notes arrow_drop_up

Coder Machine Learner Social Activist Vocalist

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.