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+--- Thread: HP Prime: Base 10 - Base 12 Conversions (/thread-7688.html)
HP Prime: Base 10 - Base 12 Conversions - Eddie W. Shore - 01-31-2017 04:20 AM
Conventions:
X = 10
E = 11
(notation by William A. Dwiggins)
HP Prime Program DEC2DUO
Enter the integer as a number.
Code:
EXPORT DEC2DUO(n)
BEGIN
// integer
// EWS 2017-01-30
// base 10 to base 12
LOCAL s,d,k,q,str1;
s:=IP(LN(n)/LN(12))+1;
d:=n;
str1:=":";
FOR k FROM 1 TO s DO
q:=IP(d/12^(s-k));
IF q<10 THEN
str1:=str1+STRING(q);
END;
IF q==10 THEN
str1:=str1+"X";
END;
IF q==11 THEN
str1:=str1+"E";
END;
d:=d-q*12^(s-k);
END;
RETURN MID(str1,2,s+1);
END;Example: Convert 12501 from Base 10 to Base 12
DEC2DUO(12501) returns “7299”
HP Prime DUO2DEC
Enter the integer as a string, use X for 10 and E for 11
Code:
EXPORT DUO2DEC(str1)
BEGIN
// as a string, X=10, E=11
// 2017-01-30 EWS
// base 12 to base 10
LOCAL s,n,k,str2,q;
s:=DIM(str1);
n:=0;
FOR k FROM 1 TO s DO
str2:=MID(str1,k,1);
q:=EXPR(str2);
IF str2=="X" THEN
q:=10;
END;
IF str2=="E" THEN
q:=11;
END;
n:=n+q*12^(s-k);
END;
RETURN n;
END;Example: Convert X2X3 from base 12 go base 10
DUO2DEC(“X2X3”) returns 17691