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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Nth-root/BBC-BASIC/nth-root.basic Normal file
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*FLOAT 64
@% = &D0D
PRINT "Cube root of 5 is "; FNroot(3, 5, 0)
PRINT "125th root of 5643 is "; FNroot(125, 5643, 0)
END
DEF FNroot(n%, a, d)
LOCAL x0, x1 : x0 = a / n% : REM Initial guess
REPEAT
x1 = ((n% - 1)*x0 + a/x0^(n%-1)) / n%
SWAP x0, x1
UNTIL ABS (x0 - x1) <= d
= x0