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PRINT BUTTERFLY PATTERN USING C# using System; public class Test { public static void Main() { var no = Console.ReadLine(); int n = Convert.ToInt32(no); Pattern print = new Pattern(); print.Butterfly(n); } } public class Pattern { public void Butterfly(int n) {   int totalNoofStars = n*2;   int lefttriangle = 1;   int righttriangle = totalNoofStars;   for(int i=1;i<=totalNoofStars;i++)   {   if(i<=n)   {   lefttriangle++;   righttriangle--;   }   else   {    if(i==n+1)   {   lefttriangle= lefttriangle;   righttriangle = righttriangle;   }   else   {   lefttriangle--;   righttriangle++;   }   }   for(int j=1;j<=totalNoofStars;j++)   {   if(j<lefttriangle || j> righttriangle)   {   Console.Write("*");   }   else   {   Console.Write(" ");   }   }   Console.WriteL

using System; public class Test { public static void Main() { var length = Console.ReadLine(); int l = Convert.ToInt32(length); var breadth = Console.ReadLine(); int b = Convert.ToInt32(breadth); PrintRectangle print = new PrintRectangle(); print.PrintHollowRectangle(l,b); } } public class PrintRectangle { public void PrintHollowRectangle(int l,int b) { for(int i=0;i<b;i++) { for(int j=0;j<l;j++) { if(i!=0 && i!=b-1 && j!=0 && j!=l-1) { Console.Write("   "); } else { Console.Write(" * "); } } Console.WriteLine(); } } } INPUT 5  4 OUTPUT * * * * * * * * * * * * * *

using System; public class Test { public static void Main() { var length = Console.ReadLine(); int l = Convert.ToInt32(length); var breadth = Console.ReadLine(); int b = Convert.ToInt32(breadth); PrintPattern print = new PrintPattern(); print.PrintRectangle(l,b); } } public class PrintPattern { public void PrintRectangle(int l,int b) { for(int i=0;i<b;i++) { for(int j=0;j<l;j++) { Console.Write("*"); } Console.WriteLine(); } } } Input: 5 3 Output ***** ***** *****

using System; public class Test { public static void Main() { var number = Console.ReadLine(); int n = Convert.ToInt32(number); PrintPattern print = new PrintPattern(); print.Printpyramid(n); } } public class PrintPattern { public void Printpyramid(int n) { int m = n/2; int dummy=1; for(int i=0;i<n;i++) { for(int j=n;j>i;j--) {          if(i!=0 && i!=n-1 && i!=n-2 && j!=n && j!=dummy)          {           Console.Write(" ");          }          else          {           Console.Write("*");          } }      dummy=dummy+1; Console.WriteLine(); } } }

using System; public class Test { public static void Main() { var no = Console.ReadLine(); int n = Convert.ToInt32(no); Pattern print = new Pattern(); //declaration print.HollowDiamond(n); } } //definition public class Pattern { public void HollowDiamond(int n) { int lefttriangle = n; int righttriangle=lefttriangle; int dummy=n; int m = n*2; for(int i=0;i<m;i++) { for(int j=0;j<m;j++) { if(j==lefttriangle || j==righttriangle) { Console.Write("*"); } else { Console.Write(" "); } } if(i<n-1) {   lefttriangle--;   righttriangle++; } else if(i==(n-1)) { lefttriangle=lefttriangle ; righttriangle=righttriangle; } else {       lefttriangle++;   righttriangle--; } Console.WriteLine(); } } } OUTPUT * * * *

Given a string with elements having lowercase letters and question marks. Replace each question mark with lowercase letter such that the element is not equal to the element before it and the element after it. Ex:- Input String:- abcab??bac? Output:- abcabacbaca (There can be a lot of different outputs, anyone of them was accepted) Input String:- ???????? Output:- abcdefgh SOLUTION: using System ; using System. Linq ; public class RemoveQMark { public string getcleantext ( string text ) { char [ ] textarray = text. ToCharArray ( ) ; int n = text. Length ; char [ ] cleantextarray = new char [ n ] ; int j = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( textarray [ i ] != '?' ) { cleantextarray [ j ] = textarray [ i ] ; j ++; } } string cleantext = new String ( cleantextarray. Where ( c => ! char . IsWhiteSpace ( c ) ) . Distinct ( ) . ToArray ( ) ) ; string clean = cleantext. Trim ( ) ; return

1. Print the word with odd letters as P M R A O R G O R R A P M Solution: using System; public class Test { public static void Main() { string text = Console.ReadLine(); int n=text.Length; Pattern print = new Pattern (); print.XPattern(text,n); } } public class Pattern { public void XPattern(string text,int n) { char[] textarray = text.ToCharArray(); int reverseprinter = n-1; int middleLetter = n/2; for(int i=0;i<n;i++) { for(int j=0;j<n;j++) { if(i==j && j!=middleLetter) { Console.Write(textarray[j]); } else if(j==reverseprinter) { Console.Write(textarray[reverseprinter]); reverseprinter--; } else { Console.Write("*"); } } Console.WriteLine(); } } } OUTPUT Please Enter text: INPUT : program p m r a o r g o r r a p m

using System; public class Test {       public static void Main()       {             var n = Console.ReadLine();             int no = Convert.ToInt32(n);             Pattern print = new Pattern();             print.Diamond(no);       } } public class Pattern {       public void Diamond(int n)       {             int m = n*2;                         int dummy=n;             for(int i=0;i<=m;i++)             {                   if(i<n)                   {                         dummy --;                   }                   else                   {                         if(i==n)                         {                               dummy=dummy;                         }                         else                         {                         dummy++;                         }                   }                   for(int j=0;j<n;j++)                   {                         if(j<dummy)                         {       

using System; public class Test { public static void Main() { var number = Console.ReadLine(); int n = Convert.ToInt32(number); int dummy = 0; for(int i=0;i<n;i++) { if(i>0) { dummy = i ; } for(int j=0;j<n;j++) { if(j<dummy ) { Console.Write(" "); } else { Console.Write("* "); } } Console.WriteLine(); } } } stdout Please Enter n * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System; public class Test { public static void Main() { var number = Console.ReadLine(); int n = Convert.ToInt32(number); int m = n*2; int dummy=0; for(int i=0;i<m;i++) { if(i<n) { dummy = i; } else { dummy--; } for(int j=0;j<=dummy;j++) { Console.Write("*"); } Console.WriteLine(); } } } OUTPUT * ** *** **** ***** **** *** ** *

using System; public class Test { public static void Main() { var number = Console.ReadLine(); int n = Convert.ToInt32(number); PrintPattern print = new PrintPattern(); print.Printpyramid(n); } } public class PrintPattern { public void Printpyramid(int n) { int dummy=1; for(int i=0;i<n;i++) { for(int j=n;j>i;j--) { if(i==0||j==n||j==dummy) { Console.Write("* "); } else { Console.Write(" "); } } dummy++; Console.WriteLine(); } } } OUTPUT * * * * * * * * * * * * * * *

To print the Half Pyramid pattern program using stars in C# Solution: using System;  namespace Reference  { public class Pattern { public void PrintPattern(int no) { for(int i=0;i<no;i++)   {         for(int j=0;j<=i;j++) { Console.Write("*");          } Console.WriteLine();           }     }     }     public class Test     { public static void Main() { Console.WriteLine("Please Enter n:"); var n=Console.ReadLine(); int number =Convert.ToInt32(n); Pattern po = new Pattern();      po.PrintPattern(number); } } } Output Please Enter n: * ** *** **** *****