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Currently we have no simple example: rpcalc in reverse Polish, mfcalc has functions, and lexcalc is using lex. * examples/c/calc/Makefile, examples/c/calc/calc.y, * examples/c/calc/calc.test, examples/c/calc/local.mk: New.
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
# Examples in C
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This directory contains simple examples of Bison grammar files in C.
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Most of them come from the documentation, which should be installed together
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with Bison. The URLs are provided for convenience.
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## rpcalc - Reverse Polish Notation Calculator
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The first example is that of a simple double-precision Reverse Polish
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Notation calculator (a calculator using postfix operators). This example
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provides a good starting point, since operator precedence is not an issue.
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Extracted from the documentation: "Reverse Polish Notation Calculator"
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https://www.gnu.org/software/bison/manual/html_node/RPN-Calc.html
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## calc - Simple Calculator
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This example is slightly more complex than rpcalc: it features infix
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operators (`1 + 2`, instead of `1 2 +` in rpcalc), but it does so using a
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unambiguous grammar of the arithmetics instead of using precedence
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directives (%left, etc.).
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## mfcalc - Multi-Function Calculator
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A more complete C example: a multi-function calculator. More complex than
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the previous example. Using precedence directives to support infix
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operators.
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Extracted from the documentation: "Multi-Function Calculator: mfcalc".
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https://www.gnu.org/software/bison/manual/html_node/Multi_002dfunction-Calc.html
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## lexcalc - calculator with Flex and Bison
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The calculator, redux. This time using a scanner generated by Flex.
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<!---
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Local Variables:
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fill-column: 76
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ispell-dictionary: "american"
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End:
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the "GNU Free
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Documentation License" file as part of this distribution.
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# LocalWords: mfcalc calc parsers yy
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--->
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