Exam files added

example_file/Add.asm

@@ -0,0 +1,10 @@
+// This file is part of www.nand2tetris.org
+
+// Computes R0 = 2 + 3  (R0 refers to RAM[0])
+
+@2
+D=A
+@3
+D=D+A
+@0
+M=D

example_file/Max.asm

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+// This file is part of www.nand2tetris.org
+
+   @R0
+   D=M              // D = first number
+   @R1
+   D=D-M            // D = first number - second number
+   @OUTPUT_FIRST
+   D;JGT            // if D>0 (first is greater) goto output_first
+   @R1
+   D=M              // D = second number
+   @OUTPUT_D
+   0;JMP            // goto output_d
+(OUTPUT_FIRST)
+   @R0             
+   D=M              // D = first number
+(OUTPUT_D)
+   @R2
+   M=D              // M[2] = D (greatest number)
+(INFINITE_LOOP)
+   @INFINITE_LOOP
+   0;JMP            // infinite loop

example_file/MaxL.asm

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/06/max/MaxL.asm
+
+// Symbol-less version of the Max.asm program.
+
+@0
+D=M
+@1
+D=D-M
+@10
+D;JGT
+@1
+D=M
+@12
+0;JMP
+@0
+D=M
+@2
+M=D
+@14
+0;JMP

example_file/Rect.asm

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/06/rect/Rect.asm
+
+// Draws a rectangle at the top-left corner of the screen.
+// The rectangle is 16 pixels wide and R0 pixels high.
+
+   @0
+   D=M
+   @INFINITE_LOOP
+   D;JLE 
+   @counter
+   M=D
+   @SCREEN
+   D=A
+   @address
+   M=D
+(LOOP)
+   @address
+   A=M
+   M=-1
+   @address
+   D=M
+   @32
+   D=D+A
+   @address
+   M=D
+   @counter
+   MD=M-1
+   @LOOP
+   D;JGT
+(INFINITE_LOOP)
+   @INFINITE_LOOP
+   0;JMP