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 }