Question

我正在尝试返还银行余额，该余额考虑了年数，帐户金额和利率。但是，当我编译程序时，我在return语句中收到错误。当我尝试将返回放在循环外时，我得到另一个错误。

In Loop：

Exercise3.java:35: error: missing return statement

Out of Loop：

Exercise3.java:34: error: cannot find symbol
}return sum;
        ^
symbol:   variable sum
location: class Exercise3
1 error

代码在

之下

import java.util.Scanner;//import scanner class


public class Exercise3{//Name of prograsm

    public static void main(String args[]){ //declare main method

        Scanner sc = new Scanner(System.in);//Declare the scanner method

        System.out.println("How much in in your account?");//ask user for balance details 
        double accBalance = sc.nextDouble();//Store balance details

        System.out.println("how many years are you saving? "); //ask the user for how many years they will be saveing
        double yrSaving = sc.nextDouble();// Amount of years stored

        System.out.println("What is the yearly interest rate ?");//ask the user for the interest rate
        double rateInterest = sc.nextDouble();//store the interest rate

        double results = balanceAccount(accBalance, yrSaving, rateInterest);//invoke the methofd
        System.out.println(results); //print thte  results of the method 
    }

////////////////////////////////////////////////////////////////////////////////
//Calculate the balance of the account method

    public static double balanceAccount(double accBalance, double yrSaving, double rateInterest){

        double rate = rateInterest / 100;

        for(int x = 0; x <= yrSaving; x++){

            double sum = accBalance*rate;
            return sum;
        }
    }
}

Answer 1

将此作为方法的主体使用。你的问题是你没有在每个场景中返回。你的sum逻辑也是错误的。

 double rate = rateInterest / 100;
 double sum = 0;
 for(int x = 0; x <= yrSaving; x++){
   sum += accBalance * rate;
 }
 return sum;

Answer 2

这就是我做的方式

public static double balanceAccount（double accBalance，double yrSaving，double rateInterest）{

double rate = rateInterest / 100;
double sum = 0;
double finishAmt = 0;

    sum += accBalance * rate;

    finishAmt = sum * yrSaving +(accBalance);
    return finishAmt;
}

}

使用方法计算帐户余额

2 个答案: