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1 Flonck, short for FLOating-point Numerical Calculator, is an INTERCAL
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2 version of the classic reverse-polish calculator. All values are
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3 entered and displayed as floating-point numbers. Entering a number
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4 adds it to the top of the stack. The various operations are indicated
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5 by integer number, and take their argument(s) off the top of the stack
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6 and replace it/them with the result. Besides the main stack, flonck
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7 also includes two separate "registers".
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8
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9 Note that this program requires the floating-point library in
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10 lib/floatlib.i, which should be appended to flonck.i before compiling.
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11
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12 Here is the quick-reference chart of available operations:
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13
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14 ONE OH change sign TWO OH store in M
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15 ONE add ONE ONE invert TWO ONE add to M
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16 TWO subtract ONE TWO square root TWO TWO push M
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17 THREE multiply ONE THREE ln TWO THREE exchange M
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18 FOUR divide ONE FOUR exp TWO FOUR print M
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19 FIVE remainder ONE FIVE x^y TWO FIVE store in N
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20 SIX print ONE SIX pop TWO SIX add to N
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21 SEVEN print all ONE SEVEN clear all TWO SEVEN push N
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22 EIGHT duplicate ONE EIGHT int TWO EIGHT exchange N
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23 NINE twiddle ONE NINE random TWO NINE print N
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24 THREE OH quit
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25
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26 Functions ONE through FIVE should be self-explanatory. SIX displays
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27 the topmost number on the stack without removing it. SEVEN displays
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28 the entire stack, from top to bottom, again without changing anything.
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29 EIGHT duplicates the topmost number, pushing an extra copy of it. NINE
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30 causes the top two numbers on the stack to switch places.
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31
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32 The next few functions should be familiar to anyone who's used a
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33 pocket calculator in recent memory. ONE OH multiplies the topmost
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34 number by -1. ONE ONE divides the topmost number into 1. ONE TWO is
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35 the square root function, ONE THREE is the natural logarithm function,
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36 and ONE FOUR is the exponential function. ONE FIVE raises the topmost
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37 number to the power of the next-topmost number. ONE SIX throws away
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38 the topmost number, never to be seen again. ONE SEVEN wipes out the
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39 entire stack and starts afresh. ONE EIGHT chops off the fractional
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40 part of the topmost number. ONE NINE causes a randomly chosen number
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41 between 0 and 1 to be added to the top of the stack.
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42
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43 The twenties are the functions that manipulate the two registers,
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44 named M and N. (Both registers start out initialized to zero.) TWO OH
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45 takes the topmost number off of the stack and stores it in M. TWO ONE
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46 takes the topmost number off of the stack and adds it to whatever is
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47 already in M. TWO TWO makes a copy of whatever is in M and adds it to
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48 the top of the stack. TWO THREE swaps the contents of M with the
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49 topmost number on the stack. TWO FOUR displays the contents of M
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50 without changing it. Functions TWO FIVE through TWO NINE repeat the
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51 above five functionalities for the register N.
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52
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53 And finally, as you might have guessed, writing (in) THREE OH causes
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54 flonck to come to an end.
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55
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56 If an input does not correspond to a floating-point number or an
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57 instruction, or if a function is input that requires more numbers on
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58 the stack than currently exist, or if a function overflows or returns
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59 an error, flonck prints out an error message, namely "XXX", and
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60 continues. Note that in the latter case, the values used as function
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61 arguments will still be removed from the stack.
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