diff --git a/mission_1/attacks/chintan/compiler and interpreter.docx b/mission_1/attacks/chintan/compiler and interpreter.docx
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diff --git a/mission_1/attacks/chintan/compiler and interpreter.md b/mission_1/attacks/chintan/compiler and interpreter.md
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+							#COMPILER:
+	A compiler is a program that translates a source program written in some high-level programming language  into machine code (binary 		code) . The generated machine code can be later executed many times against different data each time.
+
+							#INTERPRETER:
+	1) Parse the source code and perform its behavior directly.
+	2) Translate source code into some efficient intermediate representation and immediately execute this.
+	3) Explicitly execute stored precompiled code made by compiler which is part of the interpreter system.
+
+					#Diffrence between COMPILER and INTERPRETER:
+	1) COMPILER is a piece of code that translate the whole high level language in to the machine language. INTERPRETER makes a part of 	    the high level language and Convert them into Machine language.
+	2) If the Error is there than after converting whole Code the Compiler detects. But the INTERPRETER is detect error when the part of 		high level language is converting into the 
diff --git a/mission_1/attacks/chintan/executable_file.md b/mission_1/attacks/chintan/executable_file.md
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+++ b/mission_1/attacks/chintan/executable_file.md
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+# how to make a executable file in ruby??
+	first we have to write the environment path of the file from where the file is execute.
+	#!/usr/bin/env ruby
+	in this line the env is run a program in modified environment.
+
+	most of the file have read and write acess.but we have to give a executable acess to the file.
+	to give the acess of executable run the command ls -l hello.rb
+	
+	to execute the permisson the command is chmod 755 hello.rb
+
+	rename the file and remove the extention .rb.
+	mv hello.rb hello_rb
+	
+	now find the path using the command echo $PATH
+	now create a softlink within the /usr/local/bin/ folder.
+
+
diff --git a/mission_1/attacks/chintan/hello.CPP b/mission_1/attacks/chintan/hello.CPP
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+++ b/mission_1/attacks/chintan/hello.CPP
@@ -0,0 +1,12 @@
+#include <iostream.h>
+int main()
+{
+	int a,b,c;
+	cout<<"enter the number a:";
+	cin>>a;
+	cout<<"enter the number b:";
+	cin<<b;
+	c=a+b;
+	cout<<"sum is c:"<<c;
+	return 0;
+}
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diff --git a/mission_1/attacks/chintan/hello.rb b/mission_1/attacks/chintan/hello.rb
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+++ b/mission_1/attacks/chintan/hello.rb
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+#!/usr/bin/env ruby
+ARGV.each do|a|
+  puts "Argument: #{a}"
+end
+
+a = ARGV[0].to_i
+b = ARGV[1].to_i
+
+puts "Result: " ,a+b
\ No newline at end of file
diff --git a/mission_1/attacks/chintan/hello_rb b/mission_1/attacks/chintan/hello_rb
new file mode 100755
index 0000000..0e4adb1
--- /dev/null
+++ b/mission_1/attacks/chintan/hello_rb
@@ -0,0 +1,7 @@
+#! /usr/bin/ruby
+puts "enter the number a"
+a=gets.to_i
+puts "enter the number b"
+b=gets.to_i
+c=a+b
+print "the addition is",c
diff --git a/mission_1/attacks/chintan/ruby.md b/mission_1/attacks/chintan/ruby.md
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+++ b/mission_1/attacks/chintan/ruby.md
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+#What exactly happens when you install ruby?
+
+	When we install ruby, it gets stored in /usr/bin/env/ruby.
+	When we have to execute the ruby file and which is saved other folder than that file is not executable file because ruby give the 		environment in /usr/bin/env/ruby only.
+
+#Where does it get installed?
+
+	The path of the ruby installation is /usr/bin/ruby
+
+#What files are installed?
+
+	erb
+	gem
+	irb
+	rake
+	rdoc
+	ri
+	ruby
+	testrb
+
diff --git a/mission_1/attacks/chintan/ruby.odt b/mission_1/attacks/chintan/ruby.odt
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diff --git a/mission_2/attacks/chintan/fibo.rb b/mission_2/attacks/chintan/fibo.rb
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--- /dev/null
+++ b/mission_2/attacks/chintan/fibo.rb
@@ -0,0 +1,44 @@
+def fibo(num)
+	for num in 0..num
+		if num == 0 || num == 1
+			return num  
+		else		
+			return (num-1)+(num-2)
+		end
+		
+	end
+
+end
+begin
+  puts "\nenter number for fibonacci"
+  puts "To exit enter '-1'\n"
+  puts "Enter number:"
+  number = gets.chomp
+  num = number.to_i
+
+  
+  if /[^0-9]/.match(number)
+
+    if number.to_i == -1
+      puts "Exit"
+    else
+      puts "\nPlease enter valid positive integer\n"
+    end
+  else
+
+    result = (0..num).inject do | string , num |
+      string.to_s + "," + fibo(num).to_s 
+   end
+   if num == 0
+      result_arr = result
+    else
+      result_arr = result.split(",")
+    end
+
+   puts "\nResult:"
+    puts "you have entered number '#{num}',so f(#{num})is: #{result_arr[num]} "
+    puts "your series is: #{result}\n\n"
+  end
+end while num != -1
+
+ 
diff --git a/mission_2/attacks/chintan/fibo_rec.rb b/mission_2/attacks/chintan/fibo_rec.rb
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--- /dev/null
+++ b/mission_2/attacks/chintan/fibo_rec.rb
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+def fibo_rec(n)
+	if n == 0 || n == 1
+		return n
+	else		
+		return (fibo_rec(n-1)+fibo_rec(n-2))
+	end
+end
+begin
+  puts "\nenter number for fibonacci"
+  puts "To exit enter '-1'\n"
+  puts "Enter number:"
+  number = gets.chomp
+  n = number.to_i
+
+  
+  if /[^0-9]/.match(number)
+
+    if number.to_i == -1
+      puts "Exit"
+    else
+      puts "\nPlease enter valid positive integer\n"
+    end
+  else
+
+    result = (0..n).inject do | string , n |
+      string.to_s + "," + fibo_rec(n).to_s 
+    end
+    
+    if n == 0
+      result_arr = result
+    else
+      result_arr = result.split(",")
+    end
+
+    puts "\nResult:"
+    puts "you have entered number '#{n}',so f(#{n})is: #{result_arr[n]} "
+    puts "your series is: #{result}\n\n"
+  end
+end while n != -1