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## 6.1 Initialization and Assignment Functions

- Function:
*void***mpq_init***(mpq_t*`x`) Initialize

`x`and set it to 0/1. Each variable should normally only be initialized once, or at least cleared out (using the function`mpq_clear`

) between each initialization.

- Function:
*void***mpq_inits***(mpq_t*`x`, ...) Initialize a NULL-terminated list of

`mpq_t`

variables, and set their values to 0/1.

- Function:
*void***mpq_clear***(mpq_t*`x`) Free the space occupied by

`x`. Make sure to call this function for all`mpq_t`

variables when you are done with them.

- Function:
*void***mpq_clears***(mpq_t*`x`, ...) Free the space occupied by a NULL-terminated list of

`mpq_t`

variables.

- Function:
*void***mpq_set***(mpq_t*`rop`, const mpq_t`op`) - Function:
*void***mpq_set_z***(mpq_t*`rop`, const mpz_t`op`) Assign

`rop`from`op`.

- Function:
*void***mpq_set_ui***(mpq_t*`rop`, unsigned long int`op1`, unsigned long int`op2`) - Function:
*void***mpq_set_si***(mpq_t*`rop`, signed long int`op1`, unsigned long int`op2`) Set the value of

`rop`to`op1`/`op2`. Note that if`op1`and`op2`have common factors,`rop`has to be passed to`mpq_canonicalize`

before any operations are performed on`rop`.

- Function:
*int***mpq_set_str***(mpq_t*`rop`, const char *`str`, int`base`) Set

`rop`from a null-terminated string`str`in the given`base`.The string can be an integer like “41” or a fraction like “41/152”. The fraction must be in canonical form (see section Rational Number Functions), or if not then

`mpq_canonicalize`

must be called.The numerator and optional denominator are parsed the same as in

`mpz_set_str`

(see section Assignment Functions). White space is allowed in the string, and is simply ignored. The`base`can vary from 2 to 62, or if`base`is 0 then the leading characters are used:`0x`

or`0X`

for hex,`0b`

or`0B`

for binary,`0`

for octal, or decimal otherwise. Note that this is done separately for the numerator and denominator, so for instance`0xEF/100`

is 239/100, whereas`0xEF/0x100`

is 239/256.The return value is 0 if the entire string is a valid number, or -1 if not.

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