如何在方法中返回for语句的总和

Question

我正在尝试编写总结骰子总数的代码（不要担心骰子 [i] 的输出，我只需要返回总和）。

public static int displayAndTotalDice(int[] dice) {

        int i;

        for (i = 0; i < dice.length; ++i) {

            System.out.println("Dice " + i + " rolls: " + dice[i]);

            int sum = 0 + dice[i];

        }

        return sum;

    }

我收到错误“总和无法解析为变量。” 有什么建议？

Answer 1

sum 应该限定范围（并初始化），以便在循环后可以访问它。public static int displayAndTotalDice(int[] dice) {&nbsp; &nbsp; int i, sum = 0;&nbsp; &nbsp; for (i = 0; i < dice.length; ++i) {&nbsp; &nbsp; &nbsp; &nbsp; System.out.println("Dice " + i + " rolls: " + dice[i]);&nbsp; &nbsp; &nbsp; &nbsp; sum += dice[i];&nbsp; &nbsp; }&nbsp; &nbsp; return sum;}

Answer 2

sum在for循环中使用变量并返回其值之前，将变量的声明移动到方法级作用域中。您收到错误 “总和无法解析为变量”。因为你sum在for循环中声明，所以只在循环中可见。public static int displayAndTotalDice(int[] dice) {&nbsp; &nbsp; &nbsp; &nbsp; int i;&nbsp; &nbsp; &nbsp; &nbsp; int sum = 0;&nbsp; &nbsp; &nbsp; &nbsp; for (i = 0; i < dice.length; ++i) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println("Dice " + i + " rolls: " + dice[i]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sum += dice[i];&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; return sum;&nbsp; &nbsp; }