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Fix special cases in pow()

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Guido van Rossum 1991-05-28 21:57:39 +00:00
parent 4b9cf8eed9
commit 70d934601f
1 changed files with 12 additions and 0 deletions
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12
Objects/floatobject.c
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@ -223,8 +223,20 @@ float_pow(v, w)
} }
iv = v->ob_fval; iv = v->ob_fval;
iw = ((floatobject *)w)->ob_fval; iw = ((floatobject *)w)->ob_fval;
/* Sort out special cases here instead of relying on pow() */
if (iw == 0.0) if (iw == 0.0)
return newfloatobject(1.0); /* x**0 is 1, even 0**0 */ return newfloatobject(1.0); /* x**0 is 1, even 0**0 */
if (iv == 0.0) {
if (iw < 0.0) {
err_setstr(RuntimeError, "0.0 to the negative power");
return NULL;
}
return newfloatobject(0.0);
}
if (iv < 0.0) {
err_setstr(RuntimeError, "negative float to float power");
return NULL;
}
errno = 0; errno = 0;
ix = pow(iv, iw); ix = pow(iv, iw);
if (errno != 0) { if (errno != 0) {