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gmp

+= for GMP Floating-point Functions?

Is it possible to do a "+=" with GMP Floating-point Functions like this?

mpf_add (op1, op1, op2);

or must the three arguments always be different (requiring the use of a temp variable)?

(Same question goes for multiplication, subtraction, and division, although I'm sure the answer is the same for all four cases.)

Solution

  • The GMP manual states:

    GMP lets you use the same variable for both input and output in one call.

    I have done so with a variety of GMP functions and it has always worked properly but I don't know if I've ever done it with the mpf functions. I generally use the MPFR library and it states that you can use the same variable for input and output, too.