func (f *Float) StringBase(base int, ndigits uint) (string, error) {
if f == nil {
return "nil", nil
}
if base < 2 || base > 36 {
return "", ErrInval()
}
var exp_ C.mp_exp_t
p := C.mpf_get_str(nil, &exp_, C.int(base), C.size_t(ndigits), &f.i[0])
exp := int(exp_)
s := C.GoString(p)
C.free(unsafe.Pointer(p))
if len(s) == 0 {
return "0", nil
}
var pre = ""
if s[0:1] == "-" {
pre = "-"
s = s[1:]
}
var repeat = func(n int) string {
if n < 0 {
return ""
}
return strings.Repeat("0", n)
}
if exp < -8 || exp > 8 {
s = s[0:1] + "." + s[1:] + "e" + strconv.Itoa(exp-1)
} else if exp > 0 {
s += repeat(exp - len(s) + 1)
s = s[:exp] + "." + s[exp:]
} else {
s = "0." + repeat(-exp) + s
}
return pre + s, nil
}
func (f *Float) StringBase(base int, ndigits uint) (string, error) {
if f == nil {
return "nil", nil
}
if base < 2 || base > 36 {
return "", os.ErrInvalid
}
f.doinit()
var exp_ C.mp_exp_t
p := C.mpf_get_str(nil, &exp_, C.int(base), C.size_t(ndigits), &f.i[0])
exp := int(exp_)
s := C.GoString(p)
C.free(unsafe.Pointer(p))
if len(s) == 0 {
return "0", nil
}
if exp > 0 && exp < len(s) {
return s[:exp] + "." + s[exp:], nil
}
return s + "e" + strconv.Itoa(exp), nil
}