Feigenbaum constant calculation: Difference between revisions
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Feigenbaum constant calculation in various BASIC dialents (BASIC256, Just BASIC, True BASICc and Yabasic) |
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</pre>
=={{header|BASIC}}==
==={{header|BASIC256}}===
<lang freebasic>maxIt = 13 : maxItj = 13
a1 = 1.0 : a2 = 0.0 : d = 0.0 : d1 = 3.2
print "Feigenbaum constant calculation:"
print
print " i d"
print "======================"
for i = 2 to maxIt
a = a1 + (a1 - a2) / d1
for j = 1 to maxItj
x = 0.0 : y = 0.0
for k = 1 to 2 ^ i
y = 1 - 2 * y * x
x = a - x * x
next k
a -= x / y
next j
d = (a1 - a2) / (a - a1)
print rjust(i,3); chr(9); ljust(d,13,"0")
d1 = d
a2 = a1
a1 = a
next i</lang>
{{out}}
<pre>Same as FreeBASIC entry.</pre>
==={{header|Just BASIC}}===
<lang lb>maxit = 13 : maxitj = 13
a1 = 1.0 : a2 = 0.0 : d = 0.0 : d1 = 3.2
print "Feigenbaum constant calculation:"
print
print " i d"
print "==================="
for i = 2 to maxit
a = a1 + (a1 - a2) / d1
for j = 1 to maxitj
x = 0 : y = 0
for k = 1 to 2 ^ i
y = 1 - 2 * y * x
x = a - x * x
next k
a = a - (x / y)
next j
d = (a1 - a2) / (a - a1)
print i; tab(8); d
d1 = d
a2 = a1
a1 = a
next i</lang>
==={{header|True BASIC}}===
<lang qbasic>LET maxit = 13
LET maxitj = 13
LET a1 = 1.0
LET d1 = 3.2
PRINT "Feigenbaum constant calculation:"
PRINT
PRINT " i d"
PRINT "==================="
FOR i = 2 to maxit
LET a = a1 + (a1 - a2) / d1
FOR j = 1 to maxitj
LET x = 0
LET y = 0
FOR k = 1 to 2 ^ i
LET y = 1 - 2 * y * x
LET x = a - x * x
NEXT k
LET a = a - (x / y)
NEXT j
LET d = (a1 - a2) / (a - a1)
PRINT using "### ##.#########": i, d
LET d1 = d
LET a2 = a1
LET a1= a
NEXT i
END</lang>
{{out}}
<pre>Same as FreeBASIC entry.</pre>
==={{header|Yabasic}}===
<lang freebasic>maxIt = 13 : maxItj = 13
a1 = 1.0 : a2 = 0.0 : d = 0.0 : d1 = 3.2
print "Feigenbaum constant calculation:"
print "\n i d"
print "===================="
for i = 2 to maxIt
a = a1 + (a1 - a2) / d1
for j = 1 to maxItj
x = 0.0 : y = 0.0
for k = 1 to 2 ^ i
y = 1 - 2 * y * x
x = a - x * x
next k
a = a - x / y
next j
d = (a1 - a2) / (a - a1)
print i using("###"), chr$(9), d
d1 = d
a2 = a1
a1 = a
next i</lang>
=={{header|C}}==
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