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instance method
BigDecimal#to_s
to_s(p1 = v1)
ext/bigdecimal/bigdecimal.c
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static VALUE
BigDecimal_to_s(int argc, VALUE *argv, VALUE self)
{
ENTER(5);
int fmt = 0; /* 0: E format, 1: F format */
int fPlus = 0; /* 0: default, 1: set ' ' before digits, 2: set '+' before digits. */
Real *vp;
volatile VALUE str;
char *psz;
char ch;
size_t nc, mc = 0;
SIGNED_VALUE m;
VALUE f;
GUARD_OBJ(vp, GetVpValue(self, 1));
if (rb_scan_args(argc, argv, "01", &f) == 1) {
if (RB_TYPE_P(f, T_STRING)) {
psz = StringValueCStr(f);
if (*psz == ' ') {
fPlus = 1;
psz++;
}
else if (*psz == '+') {
fPlus = 2;
psz++;
}
while ((ch = *psz++) != 0) {
if (ISSPACE(ch)) {
continue;
}
if (!ISDIGIT(ch)) {
if (ch == 'F' || ch == 'f') {
fmt = 1; /* F format */
}
break;
}
mc = mc*10 + ch - '0';
}
}
else {
m = NUM2INT(f);
if (m <= 0) {
rb_raise(rb_eArgError, "argument must be positive");
}
mc = (size_t)m;
}
}
if (fmt) {
nc = VpNumOfChars(vp, "F");
}
else {
nc = VpNumOfChars(vp, "E");
}
if (mc > 0) {
nc += (nc + mc - 1) / mc + 1;
}
str = rb_usascii_str_new(0, nc);
psz = RSTRING_PTR(str);
if (fmt) {
VpToFString(vp, psz, mc, fPlus);
}
else {
VpToString (vp, psz, mc, fPlus);
}
rb_str_resize(str, strlen(psz));
return str;
}
to_s(s)
Converts the value to a string.
The default format looks like 0.xxxxEnn.
The optional parameter s consists of either an integer; or an optional ‘+’ or ‘ ’, followed by an optional number, followed by an optional ‘E’ or ‘F’.
If there is a ‘+’ at the start of s, positive values are returned with a leading ‘+’.
A space at the start of s returns positive values with a leading space.
If s contains a number, a space is inserted after each group of that many fractional digits.
If s ends with an ‘E’, engineering notation (0.xxxxEnn) is used.
If s ends with an ‘F’, conventional floating point notation is used.
Examples:
Example
BigDecimal('-123.45678901234567890').to_s('5F') #=> '-123.45678 90123 45678 9' BigDecimal('123.45678901234567890').to_s('+8F') #=> '+123.45678901 23456789' BigDecimal('123.45678901234567890').to_s(' F') #=> ' 123.4567890123456789'