我对C＃中的方法概念并不陌生，我正努力解决这个使用方法来计算复利的问题。我的代码本身有几个问题，但是我苦苦挣扎的主要概念是如何通过使用我的方法CalculateCompoundInterest（两个版本）来返回变量“ double finalAmount”。到目前为止，这是我的代码：
using System;
namespace CompoundInterestCalculator
{
public class CompoundCalculator
{
const int EXIT = 0;
const int CALCULATE_DAILY = 1;
const int CALCULATE_QUARTERLY = 2;
const int CALCULATE_VARIABLE = 3;
const int NUM_OPTIONS = 3;
public static void Main()
{
int menuOption;
WelcomeMessage();
do
{
DisplayMenu();
menuOption = ReadOption();
if (menuOption != EXIT)
{
double finalAmount = CalculateInterest(menuOption);
OutputResult(finalAmount);
}
} while (menuOption != EXIT);
ExitProgram();
} // end Main
// Fill in the appropriate modifier and return type (_ _) in the method declaration
public static void WelcomeMessage()
{
Console.WriteLine("\n\n\tCompound Interest Calculator\n");
} // end WelcomeMessage
// Fill in the appropriate modifier and return type (_ _) in the method declaration
public static void ExitProgram()
{
Console.Write("\n\nPress enter to exit.");
Console.ReadLine();
} // end ExitProgram
static void DisplayMenu()
{
string menu = "\n\n1) Calculate final amount after interest (compounded daily)"
+ "\n2) Calculate final amount after interest (compounded quarterly)"
+ "\n3) Calculate final amount after interest (define number of times compounded yearly)"
+ "\n\nEnter your option(1-3 or 0 to exit): ";
Console.Write(menu);
} // end DisplayMenu
public static void OutputResult(double finalAmount)
{
// Display the message "The final amount of money plus interest is: $(amount)"
// The amount should display as currency, with two decimal places, e.g. $10,000.00
Console.WriteLine("The final amount of money plus interest is: ${0.2}", finalAmount);
} // end OutputResult
static int ReadOption()
{
string choice;
int option;
bool okayChoice;
do
{
choice = Console.ReadLine();
okayChoice = int.TryParse(choice, out option);
if (!okayChoice || option < 0 || option > NUM_OPTIONS)
{
okayChoice = false;
Console.WriteLine("You did not enter a correct option.\n\n Please try again");
DisplayMenu();
}
} while (!okayChoice);
return option;
} // end ReadOption
public static double CalculateInterest(int menuOption)
{
// (For this exercise, we will assume the user is inputting correct input.)
double principal;
double interestRate;
int numYears;
double finalAmount;
Console.Write("Enter the principal amount: ");
principal = Double.Parse(Console.ReadLine());
Console.Write("Enter the interest rate: ");
interestRate = Double.Parse(Console.ReadLine());
Console.Write("Enter the number of years that interest is accumulated for: ");
numYears = Int32.Parse(Console.ReadLine());
if (menuOption == CALCULATE_DAILY || menuOption == CALCULATE_QUARTERLY)
{
if (menuOption == CALCULATE_DAILY)
{
// Call the appropriate CalculateCompoundInterest method
CalculateCompoundInterest( principal, interestRate, numYears);
}
else
{
// Call the appropriate CalculateCompoundInterest method
CalculateCompoundInterest( principal, interestRate, numYears, 4);
}
}
else
{
Console.Write("Enter the number of times the interest is compounded yearly: ");
int numTimesCompounded = Int32.Parse(Console.ReadLine());
// Call the appropriate CalculateCompoundInterest method
CalculateCompoundInterest( principal, interestRate, numYears, numTimesCompounded);
}
Console.WriteLine();
// return the amount calculated by the compound interest method
return finalAmount;
} // End CalculateInterest
// Declare and implement the method CalculateCompoundInterest whose parameters are the principal, interest rate, and number of years (in that order)- make sure it is public!
// For the declaration select an appropriate modifier, return type, and types for the parameters
// This version assumes the interest is compounded daily (365 times a year)
// For both methods, you should assume the interest rate is input already in decimal form (i.e. 0.02 rather than 2 for a 2% rate)
public static double CalculateCompoundInterest(double principal, double interestRate, int numYears )
{
double compoundInterest;
compoundInterest = principal * Math.Pow(1 + interestRate / numYears, 1);
return compoundInterest;
}
// Declare and implement the method CalculateCompoundInterest whose parameters are the principal, interest rate, number of years, and number of times compounded yearly - make sure it is public!
// For the declaration select an appropriate modifier, return type, and types for the parameters
// This version allows the number of times compounded yearly to be specified.
public static double CalculateCompoundInterest(double principal, double interestRate, int numYears, int numTimesCompounded)
{
double compoundInterest;
compoundInterest = principal * Math.Pow(1 + interestRate / numYears, numTimesCompounded);
return compoundInterest;
}
}//end class
}//end namespace
基本上，我试图弄清楚如何从方法中获取结果，以及如何在其他方法中使用它们（例如，用于值/参数算术）。如果您认为该程序的目的（计算复利）有其他问题，请随时告诉我。还请告知我这是否不适合Stack Overflow，我是该网站的新手。谢谢大家。
答案 0 :(得分：0)
我“想”这就是您要寻找的东西
var interest = CalculateCompoundInterest( principal, interestRate, numYears, 4);
修改
此外，您可能希望将以下2种方法重构为1种方法。提示-可选参数
public static double CalculateCompoundInterest(double principal, double interestRate, int numYears )
{
double compoundInterest;
compoundInterest = principal * Math.Pow(1 + interestRate / numYears, 1);
return compoundInterest;
}
public static double CalculateCompoundInterest(double principal, double interestRate, int numYears, int numTimesCompounded)
{
double compoundInterest;
compoundInterest = principal * Math.Pow(1 + interestRate / numYears, numTimesCompounded);
return compoundInterest;
}
}