我正在學(xué)習(xí)golang，研究貨幣時(shí)間價(jià)值我試圖計(jì)算要說(shuō)的期間數(shù)，使您的錢(qián)增加一倍。我正在使用的公式是period = log（fv / pv）/ log（1 + i）。到目前為止，我有...package mainimport ( "fmt" "math")var ( interest, futureValue, period, presentValue float64)var rate float64 = interest / 100 //converts interest into decimal... interest / 100var ratex float64 = 1 + interest //used for (1 + i)func main() { numPeriod()}func numPeriod() { fmt.Println("Enter interest amount: ") fmt.Scanf("%g", &interest) fmt.Println("Enter present value: ") fmt.Scanf("%g", &presentValue) fmt.Println("Enter future value: ") fmt.Scanf("%g", &futureValue) var logfvpvFactor float64 = futureValue / presentValue var logi float64 = math.Log(ratex) var logfvpv float64 = math.Log(logfvpvFactor) period = logfvpv / logi fmt.Printf("Number of period/s is = %g\n", period)}運(yùn)行這個(gè)，我得到...Number of period/s is = +Inf...我要找的答案是整數(shù)或浮點(diǎn)數(shù)。我怎么得到的？
3 回答
繁星點(diǎn)點(diǎn)滴滴
TA貢獻(xiàn)1803條經(jīng)驗(yàn) 獲得超3個(gè)贊
為了擴(kuò)展迭戈的答案，您已經(jīng)知道了
var ratex float64 = 1 + interest
在定義利息之前，所以它是0，ratex變成1。
var logi float64 = math.Log(ratex)
并且由于ratex為1，且log 1為0，logi變?yōu)?。然后通過(guò)除以logi定義周期，即0，因此將得到+ inf。
您應(yīng)該做的是在獲得感興趣的輸入后，將值分配給ratex。
人到中年有點(diǎn)甜
TA貢獻(xiàn)1895條經(jīng)驗(yàn) 獲得超7個(gè)贊
當(dāng)您分配ratex的值時(shí)，興趣為0。因此，增加您的值所需的時(shí)間將是無(wú)窮大。您想要的是：
func numPeriod() {
fmt.Println("Enter interest amount: ")
fmt.Scanf("%g", &interest)
var ratex float64 = 1 + interest / 100 //used for (1 + i)
fmt.Println("Enter present value: ")
fmt.Scanf("%g", &presentValue)
fmt.Println("Enter future value: ")
fmt.Scanf("%g", &futureValue)
var logfvpvFactor float64 = futureValue / presentValue
var logi float64 = math.Log(ratex)
var logfvpv float64 = math.Log(logfvpvFactor)
period = logfvpv / logi
fmt.Printf("Number of period/s is = %g\n", period)
}
手掌心
TA貢獻(xiàn)1942條經(jīng)驗(yàn) 獲得超3個(gè)贊
(09:54) jnml@fsc-r550:~/src/tmp/SO/13739751$ cat main.go
package main
import (
"fmt"
"math"
)
func main() {
var i, pv, fv float64
fmt.Println("Enter interest amount: ")
fmt.Scanf("%g", &i)
fmt.Println("Enter present value: ")
fmt.Scanf("%g", &pv)
fmt.Println("Enter future value: ")
fmt.Scanf("%g", &fv)
fmt.Printf("Number of period/s is = %g\n", math.Log(fv/pv)/math.Log(1+i))
}
(09:54) jnml@fsc-r550:~/src/tmp/SO/13739751$ go run main.go
Enter interest amount:
.1
Enter present value:
100
Enter future value:
200
Number of period/s is = 7.272540897341713
(09:54) jnml@fsc-r550:~/src/tmp/SO/13739751$
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