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2.1.7 Compiling the Parser Implementation File

Here is how to compile and run the parser implementation file:

# List files in current directory.
$ ls
rpcalc.tab.c  rpcalc.y
# Compile the Bison parser.
# -lm’ tells compiler to search math library for pow.
$ cc -lm -o rpcalc rpcalc.tab.c
# List files again.
$ ls
rpcalc  rpcalc.tab.c  rpcalc.y

The file rpcalc now contains the executable code. Here is an example session using rpcalc.

$ rpcalc
4 9 +
⇒ 13
3 7 + 3 4 5 *+-
⇒ -13
3 7 + 3 4 5 * + - n              Note the unary minus, ‘n
⇒ 13
5 6 / 4 n +
⇒ -3.166666667
3 4 ^                            Exponentiation
⇒ 81
^D                               End-of-file indicator
$