(gmp.info.gz) Initializing Integers

 
 Initialization Functions
 ========================
 
 The functions for integer arithmetic assume that all integer objects are
 initialized.  You do that by calling the function `mpz_init'.  For
 example,
 
      {
        mpz_t integ;
        mpz_init (integ);
        ...
        mpz_add (integ, ...);
        ...
        mpz_sub (integ, ...);
      
        /* Unless the program is about to exit, do ... */
        mpz_clear (integ);
      }
 
    As you can see, you can store new values any number of times, once an
 object is initialized.
 
  - Function: void mpz_init (mpz_t INTEGER)
      Initialize INTEGER, and set its value to 0.
 
  - Function: void mpz_init2 (mpz_t INTEGER, unsigned long N)
      Initialize INTEGER, with space for N bits, and set its value to 0.
 
      N is only the initial space, INTEGER will grow automatically in
      the normal way, if necessary, for subsequent values stored.
      `mpz_init2' makes it possible to avoid such reallocations if a
      maximum size is known in advance.
 
  - Function: void mpz_clear (mpz_t INTEGER)
      Free the space occupied by INTEGER.  Call this function for all
      `mpz_t' variables when you are done with them.
 
  - Function: void mpz_realloc2 (mpz_t INTEGER, unsigned long N)
      Change the space allocated for INTEGER to N bits.  The value in
      INTEGER is preserved if it fits, or is set to 0 if not.
 
      This function can be used to increase the space for a variable in
      order to avoid repeated automatic reallocations, or to decrease it
      to give memory back to the heap.
Info Catalog
(gmp.info.gz) Integer Functions
(gmp.info.gz) Assigning Integers
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