Four bit adder: Difference between revisions
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: (4bitsAdder T T T T NIL NIL NIL T) |
: (4bitsAdder T T T T NIL NIL NIL T) |
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-> (T NIL NIL NIL NIL)</pre> |
-> (T NIL NIL NIL NIL)</pre> |
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=={{header|PL/I}}== |
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<lang PL/I> |
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/* A 4-bit adder. */ |
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TEST: PROCEDURE OPTIONS (MAIN); |
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DECLARE CARRY BIT (1) ALIGNED; |
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DECLARE CARRY_IN BIT (1) STATIC INITIAL ('0'B) ALIGNED; |
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declare (m, n, sum)(4) bit(1) aligned; |
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declare i fixed binary; |
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get edit (m, n) (b(1)); |
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put edit (m, ' + ', n, ' = ') (4 b, a, 4 b, a); |
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do i = 4 to 1 by -1; |
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call full_adder (carry_in, m(i), n(i), sum(i), carry); |
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carry_in = carry; |
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end; |
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put edit (sum) (b); |
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HALF_ADDER: PROCEDURE (IN1, IN2, SUM, CARRY); |
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DECLARE (IN1, IN2, SUM, CARRY) BIT (1) ALIGNED; |
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SUM = ^( (IN1 & IN2) | ( ^IN1 & ^IN2) ); |
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CARRY = IN1 & IN2; |
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END HALF_ADDER; |
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FULL_ADDER: PROCEDURE (CARRY_IN, IN1, IN2, SUM, CARRY); |
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DECLARE (CARRY_IN, IN1, IN2, SUM, CARRY) BIT (1) ALIGNED; |
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DECLARE (SUM2, CARRY2) BIT (1) ALIGNED; |
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CALL HALF_ADDER (CARRY_IN, IN1, SUM, CARRY); |
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CALL HALF_ADDER (SUM, IN2, SUM2, CARRY2); |
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SUM = SUM2; |
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CARRY = CARRY | CARRY2; |
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END FULL_ADDER; |
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END TEST; |
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</lang> |
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=={{header|PureBasic}}== |
=={{header|PureBasic}}== |
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<lang PureBasic>;Because no representation for a solitary bit is present, bits are stored as bytes. |
<lang PureBasic>;Because no representation for a solitary bit is present, bits are stored as bytes. |
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