source: code/trunk/vendor/modernc.org/mathutil/rat.go@ 823

// Copyright (c) 2014 The mathutil Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package mathutil // import "modernc.org/mathutil"

// QCmpUint32 compares a/b and c/d and returns:
//
//   -1 if a/b <  c/d
//    0 if a/b == c/d
//   +1 if a/b >  c/d
//
func QCmpUint32(a, b, c, d uint32) int {
        switch x, y := uint64(a)*uint64(d), uint64(b)*uint64(c); {
        case x < y:
                return -1
        case x == y:
                return 0
        default: // x > y
                return 1
        }
}

// QScaleUint32 returns a such that a/b >= c/d.
func QScaleUint32(b, c, d uint32) (a uint64) {
        return 1 + (uint64(b)*uint64(c))/uint64(d)
}