github.com/m3db/m3@v1.5.0/src/dbnode/encoding/testgen/generate.go (about)

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package testgen
    22  
    23  import (
    24  	"math"
    25  	"math/rand"
    26  	"strconv"
    27  )
    28  
    29  // GenerateFloatVal generates a random float val given the number of digits and decimal places
    30  func GenerateFloatVal(r *rand.Rand, numDig, numDec int) float64 {
    31  	var val float64
    32  	digMod := int(math.Pow10(numDig))
    33  	decMod := int(math.Pow10(numDec))
    34  	dig := r.Int() % digMod
    35  
    36  	if numDec == 0 {
    37  		val = float64(dig)
    38  	} else {
    39  		dec := r.Int() % decMod
    40  		val, _ = strconv.ParseFloat(strconv.Itoa(dig)+"."+strconv.Itoa(dec), 64)
    41  	}
    42  
    43  	return val
    44  }