Question

为什么不是“int total =（mark / overall）* 100;”工作？当我输入25和50时它应该是50％，它计算25/50 * 100.但它显示0％而不是很奇怪。有什么建议??

    public class MarksCalculator {
        private static Scanner kb = new Scanner(System.in);

        public static void main (String[]args) {

            int mark = 0, overall = 0;

            //System.out.print("Hello Deepo!  To calculate the marks enter value (percantage) of the task: ");
            //int weight = kb.nextInt();

            System.out.print("Enter your marks for this Task/Assesment/Test: ");
            mark = kb.nextInt();

            System.out.print("What was this mark out of: ");
            overall = kb.nextInt();

            int total = (mark/overall) * 100;

            System.out.println("You have scored " + total + "% with this assesment.");
}
}

Answer 1

你需要投两次：

double total = ((double)mark/overall) * 100;

来自Chapter 15：

如果提升的类型是int或long，则整数算术是进行。

Answer 2

如果你想避免浮点（但为什么？），你也可以重新排序因子：

int total = 100 * mark / overall;

简单的数学不能按预期显示？

2 个答案: