github.com/webx-top/com@v1.2.12/math.go (about)

     1  // Copyright 2014 com authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package com
    16  
    17  import (
    18  	"math"
    19  )
    20  
    21  // PowInt is int type of math.Pow function.
    22  func PowInt(x int, y int) int {
    23  	num := 1
    24  	for i := 0; i < y; i++ {
    25  		num *= x
    26  	}
    27  	return num
    28  }
    29  
    30  // Round 保留几位小数(四舍五入)
    31  func Round(f float64, n int) float64 {
    32  	pow10n := math.Pow10(n)
    33  	return math.Trunc((f+0.5/pow10n)*pow10n) / pow10n
    34  }