Increment a numerical string: Difference between revisions

=={{header|Picat}}==

parse_term/1 is the best to use if there can be no assumption of the type of the number (integer or float). For integers to_int/1 is better to use, and for floats to_float/1.

<lang Picat>go =>

% integer

Int = "123",

println(int=Int),

println(parse_term=Int.parse_term+1),

println(to_int=Int.to_int+1), % assumes integer

nl,

% float

Float = "122.5",

println(float=Float),

println(parse_term=Float.parse_term+1),

println(to_float=Float.to_float+1),

nl.

</lang>

Output:

<pre>int = 123

parse_term = 124

to_int = 124

float = 122.5

parse_term = 123.5

to_float = 123.5</pre>

parse term/3 can evaluate numeric expressions with the help of apply/1:

<lang Picat>go2 =>

T = "2**16+1",

println(t=T),

parse_term(T,Term, _Vars),

println(term=Term),

println(apply=Term.apply).

</lang>

Output:

<pre>t = 2**16+1

term = 2 ** 16 + 1

apply = 65537</pre>