Execute Brain****: Difference between revisions
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m (→Interpreter: Layout: sometimes alternating line types can be converted to table style) |
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I = I + 1 !Advance one. The classic. |
I = I + 1 !Advance one. The classic. |
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SELECT CASE(C) !Now decode the instruction. |
SELECT CASE(C) !Now decode the instruction. |
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CASE(">") !Move the data finger one place right. |
CASE(">"); D = D + 1 !Move the data finger one place right. |
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D = D |
CASE("<"); D = D - 1 !Move the data finger one place left. |
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CASE(" |
CASE("+"); STORE(D) = CHAR(ICHAR(STORE(D)) + 1) !Add one to the fingered datum. |
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D = D - 1 |
CASE("-"); STORE(D) = CHAR(ICHAR(STORE(D)) - 1) !Subtract one. |
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CASE(" |
CASE("."); WRITE (MSG,1) STORE(D) !Write a character. |
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CASE(","); READ (KBD,1) STORE(D) !Read a character. |
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CASE(" |
CASE("["); IF (ICHAR(STORE(D)).EQ.0) CALL SEEK(+1) !Conditionally, surge forward. |
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CASE("]"); IF (ICHAR(STORE(D)).NE.0) CALL SEEK(-1) !Conditionally, retreat. |
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CASE(".") !Write a character. |
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WRITE (MSG,1) STORE(D) |
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CASE(",") !Read a character. |
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READ (KBD,1) STORE(D) |
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CASE("[") !Conditionally, surge forward. |
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IF (ICHAR(STORE(D)).EQ.0) CALL SEEK(+1) |
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CASE("]") !Conditionally, retreat. |
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IF (ICHAR(STORE(D)).NE.0) CALL SEEK(-1) |
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CASE DEFAULT !For all others, |
CASE DEFAULT !For all others, |
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!Do nothing. |
!Do nothing. |
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END SELECT !That was simple. |
END SELECT !That was simple. |
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END DO !See what comes next. |
END DO !See what comes next. |
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