method

to_s

v1_8_6_287 - Show latest stable - 0 notes - Class: Float

to_s() public

Returns a string containing a representation of self. As well as a fixed or exponential form of the number, the call may return ``NaN'', ``Infinity'', and ``-Infinity''.

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/*
 *  call-seq:
 *     flt.to_s    => string
 *  
 *  Returns a string containing a representation of self. As well as a
 *  fixed or exponential form of the number, the call may return
 *  ``<code>NaN</code>'', ``<code>Infinity</code>'', and
 *  ``<code>-Infinity</code>''.
 */

static VALUE
flo_to_s(flt)
    VALUE flt;
{
    char buf[32];
    double value = RFLOAT(flt)->value;
    char *p, *e;

    if (isinf(value))
        return rb_str_new2(value < 0 ? "-Infinity" : "Infinity");
    else if(isnan(value))
        return rb_str_new2("NaN");

    sprintf(buf, "%#.15g", value); /* ensure to print decimal point */
    if (!(e = strchr(buf, 'e'))) {
        e = buf + strlen(buf);
    }
    if (!ISDIGIT(e[-1])) { /* reformat if ended with decimal point (ex 111111111111111.) */
        sprintf(buf, "%#.14e", value);
        if (!(e = strchr(buf, 'e'))) {
            e = buf + strlen(buf);
        }
    }
    p = e;
    while (p[-1]=='0' && ISDIGIT(p[-2]))
        p--;
    memmove(p, e, strlen(e)+1);
    return rb_str_new2(buf);
}

to_s

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