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 static void Main(string[] args)
        {
            int a, x, n = 71, o = 70, y = 1, c;
            for (x = 1; x <= 7; x++)
              {
                for (a = 65; a <= n; a++)
               { 
                    Console.Write(Convert.ToChar(a)); 
               }
                if (x == 2)
                 o = 70;
                for (c = 2; c < y; c++)
                 Console.Write(" ");
                for (a = o; a >= 65; a--)
                 Console.Write((char)a);
                 Console.WriteLine();
                   n--;
                   o--;
                   y = y + 2;
              }
                           
            Console.ReadLine();
        }
 

 static void Main(string[] args)
        {
            char value;
            int a;
            Console.WriteLine("Enter value to check Character, integer or special symbols ");
            value = Convert.ToChar(Console.ReadLine());
            a=(int)value;
            if (a >= 65 && a <= 90 || a >= 97 && a <= 122)
                Console.WriteLine("Entered Value is Character");
            else if(a>=48 && a<=57)
                Console.WriteLine("Entered Value is Integer");
            else if(a>=0 && a<=47 || a>=58&&a<=64 || a>=91&&a<=96 || a>=123&&a<=127)
                Console.WriteLine("Entered Value is Special Symbols");
            else
                Console.WriteLine("Invlaid input :(");
            Console.ReadLine();
        }
 

 static void Main(string[] args)
        {
            int num, i;
              Console.WriteLine("Enter the number to check number is prime or composite");
                num=Convert.ToInt32(Console.ReadLine());
                i = 2;
                while (i <= num - 1)
                {
                    if (num % i == 0)
                    {
                        Console.WriteLine("composite number: "+num);
                        break;
                    }
                    i++;
                }
                if (i == num)
                    Console.WriteLine("prime number: " + num);
                Console.ReadLine();           
            
        }
 

 public class _fib
    {
        int f = 0, s = 1, n, fib = 0;
        public void _show()
        {
            Console.WriteLine("\n\t\tPrint fibonacci series 0 1 1 2 3 5 8 13 ...\n\n");
            Console.Write("\n\t\tEnter range of terms of fibonacci series : ");
            n = Convert.ToInt32(Console.ReadLine());
            Console.Write("\n\t\tFirst {0} terms are : ", n);
            for (int x = 0; x < n; x++)
            {
                if (x <= 1)
                { fib = x; }
                else
                {
                    fib = f + s;
                    f = s;
                    s = fib;
                }
                Console.Write("{0} ", fib);
            }
            Console.WriteLine("\n");
        }
    }
 

static void Main(string[] args)
        {
            int i=0;
            Console.WriteLine("ASCII      Char");
            while (i <= 255)
            {
                Console.WriteLine(i+"           "+(char)i);
                i++;
            }
            Console.ReadLine();
}

static void Main(string[] args)
        {
            int i, j, num;
            Console.WriteLine("Enter value of num:");
            num = Convert.ToInt32(Console.ReadLine());
            for (i = 1; i <= num; i++)
            {
                for (j = 1; j <= i; j++)
                    Console.Write(i + " ");
            }
            Console.ReadLine();
        }

static void Main(string[] args)
        {
              int i,j,ch=0,n;
            Console.Write("A ");
            for (i = 1; i <= 4; i++)
            {
                n = 1;
                for (j = 1; j <= i; j++)
                {
                    n = n * 2;
                    ch = 64 + n;
                }
                Console.Write((char)ch + " ");
            }
            
                Console.ReadLine();
        }

static void Main(string[] args)
        {
            int year;
            Console.WriteLine("Enter Year");
            year = Convert.ToInt32(Console.ReadLine());
           Console.WriteLine( year % 4 == 0 ? "Entered year is leap" : "Not leap year");
           Console.ReadLine();}

static void Main(string[] args)
        {
            char ch;
            int a;
            Console.WriteLine("Enter any Character:");
            ch = Convert.ToChar(Console.ReadLine());
            a=(int)ch;
            switch (ch)
            {
                case '+':
                case '-':
                case '*':
                case '/':
                case '%':
                    Console.WriteLine("Entered Character is Arithmetic");
                    break;
                case '&':
                case '|':
                case '!':
                    Console.WriteLine("Entered Character is Logical Operator");
                    break;
                case '?':
                case ':':
                    Console.WriteLine("Entered Character is Condational Operator");
                    break;
                case '<':
                case '>':
                case '=':
                    Console.WriteLine("Entered Character is Relational Operator");
                    break;
                default:
                    Console.WriteLine("Entered Character is something else not included i                     n list");
                    break;

            }
            Console.ReadLine();
        }

static void Main(string[] args)
        {
            int n,i,j;
            Console.WriteLine("Enter value of n:");
            n = Convert.ToInt32(Console.ReadLine());
              int[,]  arr=new int[n,n];
            
            for (i = 0; i < n; i++)
            {
                for (j = 0; j < n; j++)
                {
                    if (i == j)
                        arr[i, j] = 1;
                    else
                        arr[i, j] = 0;
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();  
            }
            Console.ReadLine();
        }

public class con
    {
        int num; char ch;
        float f;
        public void coversion()
        {
            Console.Write("\n\t\tEnter a number to convert : ");
            num = Convert.ToInt32(System.Console.ReadLine());
                Console.WriteLine("\t\tI -> convert from inches to centimeters.");
                Console.WriteLine("\t\tG -> convert from gallons to liters.");
                Console.WriteLine("\t\tM -> convert from mile to kilometer.");
                Console.WriteLine("\t\tP -> convert from pound to kilogram.");
                Console.Write("\n\t\tSelect conversion you want to do: ");
                ch = Convert.ToChar(System.Console.ReadLine());
                switch (ch)
                {
                    case 'I':
                        {
                            f = (float)num * (float)2.5400;
                            Console.WriteLine("\n\t\t{0} inches = {1} cm\n\n", num, f);
                            break;
                        }
                    case 'G':
                        {
                            char ch2;
                            Console.WriteLine("\t\tI=> imperial gallon");
                            Console.WriteLine("\t\tU=> US gallon");
                            Console.Write("\n\t\tWhich one you want to enter : ");
                            ch2 = Convert.ToChar(Console.ReadLine());
                            if (ch2 == 'I')
                            {
                                f = (float)num * (float)4.546;
                                Console.WriteLine("\n\t\t{0} imperial gallons = {1}  litr                                 es\n\n", num, f);
                            }
                            else if (ch2 == 'U')
                            {
                                f = (float)num * (float)3.785;
                                Console.WriteLine("\n\t\t{0} US gallons = {1} litres\n\n"                                 , num, f);
                            }
                            else
                            { Console.WriteLine("\t\tInvalid input!\n\n"); }
                            break;
                        }
                    case 'M':
                        {
                            f = (float)num * (float)1.609344;
                            Console.WriteLine("\n\t\t{0} miles = {1} Kilometers\n\n", num                              , f);
                            break;
                        }
                    case 'P':
                        {
                            f = (float)num / (float)2.2046;
                            Console.WriteLine("\n\t\t{0} lbs = {1} Kilograms\n\n", num, f                                               );
                            break;
                        }
                    default:
                        {
                            Console.WriteLine("\n\t\tInvalid input please try again!\n\n"                                              );
                            break;
                        }
                }
        }

}

static void Main(string[] args)
        {
            char ch;
            int a;
            Console.WriteLine("Enter any Character:");
            ch = Convert.ToChar(Console.ReadLine());
            a= (int)ch;
            if (a >= 65 && a <= 90)
                Console.WriteLine("Entered Character is in Capital Letter");
            else if(a>=97 && a<=122)
                Console.WriteLine("Entered Character is in Low Letter");
            else if(a>=48 && a<=57)
                Console.WriteLine("Entered Character is a digit");
            else
                Console.WriteLine("Entered Character is a Special Symbol");
                Console.ReadLine();
        }

public class circle
    {
        double x, y, c_x, c_y, radius, dis, temp;
        public double square_root(double t)
        {
            double lb = 0, ub = t, temp = 0; int count = 50;
            while (count != 0)
            {
                temp = (lb + ub) / 2;
                if (temp * temp == t)
                { return temp; }
                else if (temp * temp > t)
                { ub = temp; }
                else
                { lb = temp; }
                count--;
            }
            return temp;
        }
        public void cal()
        {
            Console.Write("\n\t\tEnter center point X : ");
            c_x = Convert.ToDouble(Console.ReadLine());
            Console.Write("\t\tEnter center point Y : ");
            c_y = Convert.ToDouble(Console.ReadLine());
            Console.Write("\t\tEnter radius : ");
            radius = Convert.ToDouble(Console.ReadLine());
            Console.Write("\t\tEnter point X : ");
            x = Convert.ToDouble(Console.ReadLine());
            Console.Write("\t\tEnter Y : ");
            y = Convert.ToDouble(Console.ReadLine());
            temp = ((c_x - x) * (c_x - x)) + ((c_y - y) * (c_y - y));
            if (temp < 0)
            { Console.WriteLine("\t\tError negative value!"); }
            else
            { dis = square_root(temp); }
            Console.WriteLine("\t\tDistance : {0}", dis);
            if (dis == radius)
            { Console.WriteLine("\t\tGiven point lies on the circle.\n\n"); }
            else if (dis > radius)
            { Console.WriteLine("\t\tGiven point lies outside the circle.\n\n"); }
            else
            { Console.WriteLine("\t\tGiven point lies inside the circle.\n\n"); }
        }
    }

 static void Main(string[] args)
        {
            double x1, x2, x3, y1, y2, y3, m1, m2;
            Console.WriteLine("Enter value of x1");
            x1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value of x2");
            x2 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value of x3");
            x3 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value of y1");
            y1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value of y2");
            y2 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter value of y3");
            y3 = Convert.ToInt32(Console.ReadLine());
            m1 = (x2 - x1) / (y2 - y1);
            m2 = (x3 - x2) / (y3 - y2);
            if (x2 - x1 == 0 || x3 - x2 == 0)
                { Console.WriteLine("\t\tInvalid input (Attempted to divide by zero)!");}
            else
                {
                    m1 = (y2 - y1) / (x2 - x1);
                    m2 = (y3 - y2) / (x3 - x2);
                    Console.WriteLine("\t\tSlope 1 = {0}", m1);
                    Console.WriteLine("\t\tSlope 2 = {0}", m2);
                    if (m1 == m2)
                    { Console.WriteLine("\n\t\tSo Given point fall on one straight line.\                      n\n"); }
                    else
                    { Console.WriteLine("\n\t\tSo Given point does not fall on one straig                      ht line.\n\n"); }
                }
              }

 .MODEL SMALL
.STACK 100H
.DATA
PROMPT  DB  "The 256 ASCII Characters are  ",0AH,"$"
nxtline DB 0AH,"$"
.CODE
start:
     MOV AX, @DATA               ; initialize DS 
     MOV DS, AX
     LEA DX, PROMPT              ; load and print PROMPT 
     MOV AH, 9h
     INT 21H
     MOV Cl, 0                   ; initialize CL
     MOV AH, 2                   ; set output function  
     LP:                         ; loop label
     Mov DL, CL
     MOV AH ,2H                  ; print ASCII character
     INT 21H                    
     LEA DX, nxtline
     MOV AH,9H
     INT 21H
     INC CL                      ; Increment CL
     CMP CL , 255D             
     JNE LP                      ; jump to label LP if CL is 255

 MOV AX,4C00H
 INT 21H
 END start