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GNU MP 4.1.2

5.3 Combined Initialization and Assignment Functions

For convenience, GMP provides a parallel series of initialize-and-set functions which initialize the output and then store the value there. These functions' names have the form mpz_init_set...

Here is an example of using one:

{ mpz_t pie; mpz_init_set_str (pie, "3141592653589793238462643383279502884", 10); ... mpz_sub (pie, ...); ... mpz_clear (pie); }

Once the integer has been initialized by any of the mpz_init_set... functions, it can be used as the source or destination operand for the ordinary integer functions. Don't use an initialize-and-set function on a variable already initialized!

Function: void mpz_init_set (mpz_t rop, mpz_t op)

Function: void mpz_init_set_ui (mpz_t rop, unsigned long int op)

Function: void mpz_init_set_si (mpz_t rop, signed long int op)

Function: void mpz_init_set_d (mpz_t rop, double op)

Initialize rop with limb space and set the initial numeric value from op.

Function: int mpz_init_set_str (mpz_t rop, char *str, int base)

Initialize rop and set its value like mpz_set_str (see its documentation above for details).

If the string is a correct base base number, the function returns 0; if an error occurs it returns -1. rop is initialized even if an error occurs. (I.e., you have to call mpz_clear for it.)