Notes

1. Write a program to display a multiplication table for a given number.
5 * 0 = 0
5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
....
5 * 10 = 50
Solution:-
internal class MultiplicationTable
{
public static void Main()
{
int j, n;

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

2. Write a program to print odd numbers from 1 to 99.
    1 is odd
    2 is even
    3 is odd
    4 is even ..... You should use "Modulo - %" to check the reminder to take a desicion 
Solution:-
internal class OddEven
{
public static void Main()
{
Console.WriteLine("Odd and Even numbers from 1 to 99.");
for (int n = 1; n < (99 + 1); n++)
{
if (n % 2 != 0)
{
Console.WriteLine("Odd Number " + n);
}
else if (n % 2 == 0)
{
Console.WriteLine("Even Number " + n);
}
}
}
}
3.  Write a C# Sharp program
to check if a given string contains between 2 and 4 'z' character
Sample Input:
"frizz"
"zane"
"Zazz"  -- 2 small z's
"zzzz"
"ZZZZ"
Expected Output:
True
False
True
True
False
Solution :-
internal class Containsz
{
public static void Main(string[] args)
{

string str = Console.ReadLine();
bool c1= str.Contains("zz");
bool c2 = str.Contains("zzzz");
if (c1 || c2)
Console.WriteLine("True");
else
Console.WriteLine("False");

}
}