On 26.07.2017 11:45, Timon Gehr wrote:
On 26.07.2017 04:37, Seb wrote:
On Tuesday, 25 July 2017 at 21:13:54 UTC, Max Haughton wrote:
Semi-Functional/pure RPN calculator: https://run.dlang.io/is/JGkBZx
This is probably too long, but it demonstrates the compiler enforced
safety and purity (State is passed through the fold), while also
showing off the higher level parts of Phobos (Use of fold).
Max, this is a great example!
However, as you noticed it's a bit long and in fact in its current
state it wouldn't look good:
http://imgur.com/a/KwczM
If there's no chance to make it shorter,
import std.stdio, std.string, std.algorithm, std.conv;
void main(){
readln.split.fold!((stack,op){
switch(op){
static foreach(c;"+-*/") case [c]:
return stack[0..$-2]~mixin("stack[$-2] "~c~" stack[$-1]");
default: return stack~op.to!real;
}
})((real[]).init).writeln;
}
(Sorry for the double post. Internet connection problem.)
