End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Numeric#imag

num.imag → 0

static VALUE
numeric_imag(VALUE self)
{
    return INT2FIX(0);
}

Returns zero.

See also #imaginary #i #floor #infinite? also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0