'C# Multiplication Table logic

I'm making a c# program that shows the multiplication table, by using my code I can print only complete table, how can I print random table as below.

my code bit:

using System;  
public class Exer
{  
    public static void Main() 
{
   int j,n;
   
    Console.Write("\n\n");
    Console.Write("Display the multiplication table:\n");
    Console.Write("-----------------------------------");
    Console.Write("\n\n");   

   Console.Write("Input the number (Table to be calculated) : ");
   n= Convert.ToInt32(Console.ReadLine());   
   Console.Write("\n");
   for(j=1;j<=10;j++)
   {
     Console.Write("{0} X {1} = {2} \n",n,j,n*j);
   }
  }
}

Expected Output:

1 x 2 = 2
2 x 2 = 4
3 x 2 = 6
1 x 4 = 4
2 x 4 = 8
3 x 4 = 12
1 x 6 = 6
2 x 6 = 12
3 x 6 = 18
1 x 8 = 8
2 x 8 = 16
3 x 8 = 24
1 x 10 = 10
2 x 10 = 20
3 x 10 = 30

enter image description here

c++sharpc#-4.0c#-2.0


Solution 1:[1]

The tables in your picture are NOT random, though. There is a definite pattern. The function, DisplayMath(), is receiving an integer parameter; 3, 4, and 5 in the picture.

The output in the pictures is most likely produced by two NESTED for loops.

The integer parameter is controlling the INNER for loop, which goes from 1 to the parameter, incrementing by 1.

The OUTER loop goes from 2 to 10, incrementing by 2.

Possible code:

public static void Main() {
    DisplayMath(4);
}

public static void DisplayMath(int x) {
    for(int y=2; y<=10; y=y+2) {
        for(int z=1; z<=x; z++) {
            Console.WriteLine("{0} X {1} = {2}",z,y,z*y);
        }
    }
}

Output:

1 X 2 = 2
2 X 2 = 4
3 X 2 = 6
4 X 2 = 8
1 X 4 = 4
2 X 4 = 8
3 X 4 = 12
4 X 4 = 16
1 X 6 = 6
2 X 6 = 12
3 X 6 = 18
4 X 6 = 24
1 X 8 = 8
2 X 8 = 16
3 X 8 = 24
4 X 8 = 32
1 X 10 = 10
2 X 10 = 20
3 X 10 = 30
4 X 10 = 40

Solution 2:[2]

As per the required output, you need to change the for loop logic a little. Because there is a logic in the expected result that you need to get before start coding, that isn't a 'random' table

for(j=2; j<=10; j=j+2 )
{
   for (mathNumber = 1; mathNumber <= n; mathNumber++  )       
   {
        Console.Write("{0} X {1} = {2} \n",mathNumber,j,mathNumber*j);
   }
}

As you can see the result must be the result of the n first numbers (being n the parameter you get from Console, but perhaps is better that you get it as argument) multiplyed by the numbers 2,4,6,8,10

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Idle_Mind
Solution 2

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