method

to_s

v1_9_3_392 - Show latest stable - 0 notes - Class: BigDecimal

to_s(p1 = v1) public

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:

BigDecimal.new(‘-123.45678901234567890’).to_s(‘5F’) -> ‘-123.45678 90123 45678 9’

BigDecimal.new(‘123.45678901234567890’).to_s(‘+8F’) -> ‘+123.45678901 23456789’

BigDecimal.new(‘123.45678901234567890’).to_s(‘ F’) -> ‘ 123.4567890123456789’

Show source

static VALUE
BigDecimal_to_s(int argc, VALUE *argv, VALUE self)
{
    ENTER(5);
    int   fmt = 0;   /* 0:E format */
    int   fPlus = 0; /* =0:default,=1: set ' ' before digits ,set '+' before digits. */
    Real  *vp;
    volatile VALUE str;
    char  *psz;
    char   ch;
    size_t nc, mc = 0;
    VALUE  f;

    GUARD_OBJ(vp,GetVpValue(self,1));

    if (rb_scan_args(argc,argv,"01",&f)==1) {
        if (RB_TYPE_P(f, T_STRING)) {
            SafeStringValue(f);
            psz = RSTRING_PTR(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 {
            mc = (size_t)GetPositiveInt(f);
        }
    }
    if (fmt) {
        nc = VpNumOfChars(vp, "F");
    }
    else {
        nc = VpNumOfChars(vp, "E");
    }
    if (mc > 0) {
        nc += (nc + mc - 1) / mc + 1;
    }

    str = rb_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

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