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I'm using "mathlink.h" to call Mathematica from a C program. I send a computation to Mathematica and its return result is a very big number (100 digits). Hence, I want to read that number as a string.

How can I do it using MathLink?


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up vote 2 down vote accepted

You could simply wrap your computation in

MLPutFunction(link, "ToString", 1);

and convert your result to a string. After that you can use MLGetString.

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One problem is if the output is an expression, say $x^2 + x + 1$, then the ToString method will return in un-readable format. What should I do if I want to read arbitrary output as a string? Like for the expression above, I expect to get output as exactly $x^2 + x + 1$. – Loi.Luu Oct 21 '13 at 6:37
and I see there is no other option for ToString method. – Loi.Luu Oct 21 '13 at 6:37
@Loi.Luu You question was how you can send very big numbers as string through MathLink. Why do you now want to send expressions? Addtionally, ToString[x^2 + x + 1, InputForm] gives a string of valid Mathematica syntax. – halirutan Oct 21 '13 at 7:36
Sorry to make you confused, I thought I can apply the same technique to expression. You are correct in both answers, thank you for your help :) – Loi.Luu Oct 21 '13 at 7:48

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