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Nighthawyun
Cheater
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Joined: 21 Jan 2019
Posts: 27
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 Posted: Sat May 25, 2019 9:08 pm Post subject: how to make calculator with string like "213 + 42 - 124 |
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how?
ex)
string "899 + 6 - 33" to result "872"
and ×, ÷ too
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TheyCallMeTim13
Wiki Contributor
 Reputation: 51
Joined: 24 Feb 2017
Posts: 976
Location: Pluto
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| Posted: Sat May 25, 2019 9:46 pm Post subject: |
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| Code: | | print(loadstring("return " .. "899 + 6 - 33")()) |
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daspamer
Grandmaster Cheater Supreme
 Reputation: 54
Joined: 13 Sep 2011
Posts: 1588
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| Posted: Sat May 25, 2019 10:28 pm Post subject: |
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A bit safer way to accomplish this and more dynamic.
| Code: | local action = {['+']= function(a,b)return a + b;end;
['-']= function(a,b)return a - b;end;
['*']= function(a,b)return a * b;end;
['/']= function(a,b)return a / b;end;
['//']=function(a,b)return a// b;end; --> math.floor equivalent
['%']= function(a,b)return a % b;end;
['^']= function(a,b)return a ^ b;end;
};
debug.setmetatable(0, {
__call = function(a, op)
if(action[op]) then
return function(b)
return action[op](a,b)
end
else
error("Wrong syntax", 2)
end
end
})
function calculate(Param1,Op,Param2,...)
if (tonumber(Param1) and action[Op] and tonumber(Param2)) then
return calculate(((Param1) (Op) (Param2)),...);
end
return Param1;
end
local a = calculate(1,'+',2) --> 3
local b = calculate(3,'+',1,'*',2,'%',3) --> ((3+1) * 2 ) % 3 --> 2 Operations priority do not apply here!
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I'm rusty and getting older, help me re-learn lua. |
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Corroder
Grandmaster Cheater Supreme
 Reputation: 75
Joined: 10 Apr 2015
Posts: 1668
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| Posted: Sun May 26, 2019 12:10 am Post subject: |
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Here is my Calculator made using CE Lua script.
It's 95% finish. Some parts did not finish yet:
1. Radix for hex, oct, bin calculation environment
2. Date calculation / manipulating under 'Date/Time Unit Calculation Menu'
3. Offset and AOB manipulation if possible.
Plan to publish it if the project is done. 
EDIT:
Next, explanation for your question:
| Code: | x = "899 + 6 - 33"
func = assert(load("return " .. x))
y = func()
print(y) --> 872
x = "100 + 6 / 2"
func = assert(load("return " .. x))
y = func()
print(y) --> 103 because 6/2 doing first then + 100
x = "(100 + 6) / 2"
func = assert(load("return " .. x))
y = func()
print(y) --> 53 because (100+6) / 2
x = "100 + 6 * 2 - 2 / 2" --- potensial confusion
func = assert(load("return " .. x))
y = func()
print(y) --> 111
note = [[
Remember math logic rules for math operator:
highest is PARENTHESES / BRACKET
then is EXPONENT / SQUARE ROOT
next is MULTIPLICATION / DIVISION
lowest is ADDITION / SUBTRACTION
So, the correct answer for "100 + 6 * 2 - 2 / 2" is
level 1 = 6 x 2 = 12
level 2 = 2 / 2 = 1
level 3 = 100
result = 100 + 12 - 1 = 111
]] |
| Description: |
| Corroder CE Lua Calculator |
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| Filesize: |
42.87 KB |
| Viewed: |
2379 Time(s) |
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Stealing Code From Stolen Code...
And Admit It.. Hmmm....Typically LOL |
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