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decus_20tap2_198111
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decus/20-0028/alis.sno
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*
* THIS PROGRAM USES PROGRAMMER-DEFINED DATA TYPES TO
* REPRESENT AN ARBITRARILY LONG INTEGER AS A LINKED LIST
* CALLED ALI. OPSYN IS USED TO DEFINE A BINARY OPERATOR
* AND TWO UNARY OPERATORS FOR MANIPULATING ALIS.
*
* % APPENDS A NODE TO THE HEAD OF A LIST. # AND / RETURN
* THE VALUE OF THE HEAD OF THE LIST, AND THE LIST LINKED
* FROM THE HEAD, RESPECTIVELY.
*
* THE OPERATORS + AND * ARE GENERALIZED TO RETURN INTEGERS
* IF THE OPERANDS ARE INTEGERS AND THE RESULT LESS THAN
* MAX (10000). IF THE RESULT IS GREATER THAN MAX, AN ALI
* IS GENERATED WITH THE VALUE OF THE HEAD EQUAL TO THE LOW
* ORDER DIGITS, AND THE LINK POINTING TO AN ALI WITH THE
* HIGHER DIGITS. IF EITHER OPERAND IS AN ALI, THE RESULT
* IS AN ALI.
*
* THE USE OF ALIS IS ILLUSTRATED BY COMPUTING THE FIRST K
* POWERS OF AN INTEGER N.
*
*
&ANCHOR = 1
OPSYN('SUM','+',2)
OPSYN('PROD','*',2)
DATA('ALI(V,L)')
DEFINE('OUT(OUT)')
DEFINE('APPEND(V,L)')
DEFINE('ADD(I1,I2)C')
DEFINE('MUL(I1,I2)C')
DEFINE('VAL(VAL)')
DEFINE('LINK(I)')
OPSYN('+','ADD',2)
OPSYN('*','MUL',2)
OPSYN('%','APPEND',2)
OPSYN('/','LINK',1)
OPSYN('#','VAL',1)
MAX = 10000
ADDFIX = RTAB(SIZE(MAX) - 1) . C REM . ADD
MULFIX = RTAB(SIZE(MAX) - 1) . C REM . MUL
* FUNCTION DEFINITIONS
*
:(FEND)
*
APPEND APPEND = ALI(V,L) :(RETURN)
*
*
ADD ADD = IDENT(I2) I1 :S(RETURN)
ADD = IDENT(I1) I2 :S(RETURN)
ADD = SUM(#I1,#I2)
LT(ADD,MAX) INTEGER(I1) INTEGER(I2) :S(RETURN)
ADD = LT(ADD,MAX) ADD % (/I1 + /I2) :S(RETURN)
ADD ADDFIX
ADD = ADD % (C + (/I1 + /I2)) :(RETURN)
*
LINK LINK = \INTEGER(I) L(I) :(RETURN)
*
VAL VAL = \INTEGER(VAL) V(VAL) :(RETURN)
*
*
*
OUT OUT = IDENT(/OUT) #OUT :S(RETURN)
OUT = OUT(/OUT) DUPL('0',SIZE(MAX) - SIZE(#OUT) - 1)
+ #OUT :(RETURN)
*
*
MUL MUL = DIFFER(#I1) DIFFER(#I2) PROD(#I1,#I2) :F(RETURN)
LT(MUL,MAX) INTEGER(I1) INTEGER(I2) :S(RETURN)
MUL = LT(MUL,MAX) MUL % ( I1 * /I2 + I2 * /I1)
+ :S(RETURN)
MUL MULFIX
MUL = MUL % (C + I1 * /I2 + I2 * /I1)
+ :(RETURN)
FEND
N = 256
K = 15
P = 1
OUTPUT = 'POWERS OF ' N
OUTPUT =
L I = LT(I,K) I + 1 :F(END)
P = P * N
OUTPUT = I ': ' OUT(P) :(L)
END