Function TestDecimal_QuoRem2

decimal_test.go:1998–2029

(t *testing.T)

}

func TestDecimal_QuoRem2(t *testing.T) {
	for _, tc := range createDivTestCases() {
		d := tc.d
		if sign(tc.d2) == 0 {
			continue
		}
		d2 := tc.d2
		prec := tc.prec
		q, r := d.QuoRem(d2, prec)
		// rule 1: d = d2*q +r
		if !d.Equal(d2.Mul(q).Add(r)) {
			t.Errorf("not fitting, d=%v, d2=%v, prec=%d, q=%v, r=%v",
				d, d2, prec, q, r)
		}
		// rule 2: q is integral multiple of 10^(-prec)
		if !q.Equal(q.Truncate(prec)) {
			t.Errorf("quotient wrong precision, d=%v, d2=%v, prec=%d, q=%v, r=%v",
				d, d2, prec, q, r)
		}
		// rule 3: abs(r)<abs(d) * 10^(-prec)
		if r.Abs().Cmp(d2.Abs().Mul(New(1, -prec))) >= 0 {
			t.Errorf("remainder too large, d=%v, d2=%v, prec=%d, q=%v, r=%v",
				d, d2, prec, q, r)
		}
		// rule 4: r and d have the same sign
		if r.value.Sign()*d.value.Sign() < 0 {
			t.Errorf("signum of divisor and rest do not match, "+
				"d=%v, d2=%v, prec=%d, q=%v, r=%v",
				d, d2, prec, q, r)
		}
	}
}

// this is the old Div method from decimal
// Div returns d / d2. If it doesn't divide exactly, the result will have