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Correct wrong calculation of pow(0.0, 0.0, negative_number)

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Guido van Rossum 1996-08-09 20:50:14 +00:00
parent 0693dd232e
commit 86c04c252b
1 changed files with 6 additions and 5 deletions
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11
Objects/floatobject.c
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@ -367,12 +367,8 @@ float_pow(v, w, z)
iw = ((floatobject *)w)->ob_fval; iw = ((floatobject *)w)->ob_fval;
intw = (long)iw; intw = (long)iw;
if (iw == intw) { if (iw == intw) {
errno = 0;
ix = powi(iv, intw);
}
else {
/* Sort out special cases here instead of relying on pow() */ /* Sort out special cases here instead of relying on pow() */
if (iw == 0.0) { /* x**0 is 1, even 0**0 */ if (intw == 0) { /* x**0 is 1, even 0**0 */
if ((object *)z!=None) { if ((object *)z!=None) {
ix=fmod(1.0, z->ob_fval); ix=fmod(1.0, z->ob_fval);
if (ix!=0 && z->ob_fval<0) ix+=z->ob_fval; if (ix!=0 && z->ob_fval<0) ix+=z->ob_fval;
@ -380,6 +376,11 @@ float_pow(v, w, z)
else ix=1.0; else ix=1.0;
return newfloatobject(ix); return newfloatobject(ix);
} }
errno = 0;
ix = powi(iv, intw);
}
else {
/* Sort out special cases here instead of relying on pow() */
if (iv == 0.0) { if (iv == 0.0) {
if (iw < 0.0) { if (iw < 0.0) {
err_setstr(ValueError, "0.0 to a negative power"); err_setstr(ValueError, "0.0 to a negative power");