Added some examples to test the interpreter

1 files changed, 28 insertions, 0 deletions

diff --git a/examples/rot13.bf b/examples/rot13.bf
new file mode 100644
index 0000000..7be1cc7
--- /dev/null
+++ b/examples/rot13.bf
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+-,+[                         Read first character and start outer character reading loop
+    -[                       Skip forward if character is 0
+        >>++++[>++++++++<-]  Set up divisor (32) for division loop
+                               (MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+        <+<-[                Set up dividend (x minus 1) and enter division loop
+            >+>+>-[>>>]      Increase copy and remainder / reduce divisor / Normal case: skip forward
+            <[[>+<-]>>+>]    Special case: move remainder back to divisor and increase quotient
+            <<<<<-           Decrement dividend
+        ]                    End division loop
+    ]>>>[-]+                 End skip loop; zero former divisor and reuse space for a flag
+    >--[-[<->+++[-]]]<[         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+        ++++++++++++<[       If flag then set up divisor (13) for second division loop
+                               (MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+            >-[>+>>]         Reduce divisor; Normal case: increase remainder
+            >[+[<+>-]>+>>]   Special case: increase remainder / move it back to divisor / increase quotient
+            <<<<<-           Decrease dividend
+        ]                    End division loop
+        >>[<+>-]             Add remainder back to divisor to get a useful 13
+        >[                   Skip forward if quotient was 0
+            -[               Decrement quotient and skip forward if quotient was 1
+                -<<[-]>>     Zero quotient and divisor if quotient was 2
+            ]<<[<<->>-]>>    Zero divisor and subtract 13 from copy if quotient was 1
+        ]<<[<<+>>-]          Zero divisor and add 13 to copy if quotient was 0
+    ]                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+    <[-]                     Clear remainder from first division if second division was skipped
+    <.[-]                    Output ROT13ed character from copy and clear it
+    <-,+                     Read next character
+]                            End character reading loop
\ No newline at end of file