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fix two (!) bugs printing floating point zero

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SVN=125260
This commit is contained in:
Rob Pike 2008-06-28 12:54:24 -07:00
parent eca23cfd92
commit ff4b01b440
1 changed files with 16 additions and 2 deletions
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18
src/lib/fmt.go
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@ -347,6 +347,9 @@ func pow10(n int) double {
} }
func unpack(a double) (negative bool, exp int, num double) { func unpack(a double) (negative bool, exp int, num double) {
if a == 0 {
return false, 0, 0.0
}
neg := a < 0; neg := a < 0;
if neg { if neg {
a = -a; a = -a;
@ -380,9 +383,20 @@ func (f *Fmt) E(a double) *Fmt {
prec = f.prec; prec = f.prec;
} }
prec++; // one digit left of decimal prec++; // one digit left of decimal
var s string;
// multiply by 10^prec to get decimal places; put decimal after first digit // multiply by 10^prec to get decimal places; put decimal after first digit
g *= pow10(prec); if g == 0 {
s := f.integer(int64(g + .5), 10, true, &ldigits); // get the digits into a string // doesn't work for zero - fake it
s = "000000000000000000000000000000000000000000000000000000000000";
if prec < len(s) {
s = s[0:prec];
} else {
prec = len(s);
}
} else {
g *= pow10(prec);
s = f.integer(int64(g + .5), 10, true, &ldigits); // get the digits into a string
}
s = s[0:1] + "." + s[1:prec]; // insert a decimal point s = s[0:1] + "." + s[1:prec]; // insert a decimal point
// print exponent with leading 0 if appropriate. // print exponent with leading 0 if appropriate.
es := New().p(2).integer(int64(exp), 10, true, &ldigits); es := New().p(2).integer(int64(exp), 10, true, &ldigits);