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Closed 11 years ago.
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Java: Parse a mathematical expression given as a string and return a number
Hello there,
I would like to ask you, if exist some way how to convert string "1+2+3" to math equation? Exist for this purpose some function or method in Java?
Thanks for hints.
It's not part of the standard API.
But I implemented it in my project, you can have a look here.
https://github.com/MarkyVasconcelos/Towel/wiki/Expression
This would necessarily depend on the implementation of the Equation class you're using. Check its API.
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Is there an equivalent in java to python functions that can parse date/time input without giving the format as an argument?
I want to be able to receive an input and determine if it's a time stamp of some sort. Is it necessary to manually go over all common patterns?
dateparser is a neat utility which might fit your case
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I want to implement the dijkstra algorithm and have to set each note at the beginning to infinity.
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Double.POSITIVE_INFINITY if you are using Double to store your data.
Also note that this is not a number, which is nice depending on what you want to do. Double supports this concept.
This question already has answers here:
Combinatoric 'N choose R' in java math?
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Sorry about the ambiguous title, I basically need to know how to use the choose function in java, to work out the chance of something happening, for example say I wanted to work out my chance of winning the lottery, on a calculator I'd do:
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Anyway, if you do 49 choose 6 on Google for example, you'll see the function I'm trying to use
Question: How do I implement this function in Java code?
Apache Commons Math has it. If you are curious, you can read about Pascal's triangle.
http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/util/CombinatoricsUtils.html#binomialCoefficient(int, int)
This question already has answers here:
How to convert number to words in java
(31 answers)
Closed 9 years ago.
I'm having a list of Integer from 1 to 100. If I loop through the list, I wanted to make the output as,
"One"
"Two" .....
"Hundred"
Is there any direct method in Java to obtain the above output?
No such method or class has been provided by JDK.
You can use the code mentioned here or here for reference purpose.
switch case are used to meet that requirement: Here
is source code.
Answer of this question described here: How to convert number to words in java
Officially this is not possible or no standard library available by native Java.
Don't duplicate.
There is none in the official Java libraries. However, the International Components for Unicode project has a RuleBasedNumberFormat with those capabilities. It even has a SPELLOUT constant.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Evaluating a math expression given in string form
How can I convert a string representing a math expression, like "1+23-56," into a number? I am trying to do this in Java.
You would have to create your own language specification, with your own grammar and then implement it, there are several examples of how to write a language for a calculator.
The basic principle is to first do a syntax analisis, generate a syntactic tree and the parse it using your language rules, the semantic analisis.
Here are some examples:
http://www.dabeaz.com/ply/ply.html#ply_nn4
http://www.dabeaz.com/ply/ply.html#ply_nn24