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【第一周】四则运算

1.需求分析:对两个数字进行加减乘除四则运算

2.算法思想:

(1)随机获取两个数字和一个运算符构成一个表达式

(2)对表达式进行四则运算并输出对错

(3)统计输出答对和答错的次数

3.具体代码:

package ruan.jian.gong.cheng;import java.util.Random;import java.util.Scanner;public class FigureOperate {    public static void main(String[] args) {        int rightNum = 0;//答对次数        int wrongNum = 0;//答错次数        for (int i =1; i <= 10; i++) {            int num1 =(int) (Math.random() * 10);//随机获取第一个数字            int num2 =(int) (Math.random() * 10);//随机获取第二个数字            // 生成随机运算符            Random num = new Random();            int index = num.nextInt(3) + 1;            char[] opes = { ‘+‘, ‘-‘, ‘*‘, ‘/‘ };            String ope = String.valueOf(opes[index]);            Scanner scan = new Scanner(System.in);            if (opes.equals("+")) { // 进行加法运算                System.out.print(num1 + "+" + num2 + "=");                int input = scan.nextInt();                int sum = num1 + num2;                if (sum==input) {                    System.out.println("正确");                    rightNum++;                } else {                    System.out.println("错误");                    wrongNum++;                }                System.out.println("正确答案是:" + sum);            }else if (opes.equals("-")) { // 进行减法运算                System.out.print(num1 + "-" + num2 + "=");                int input = scan.nextInt();                int sum = num1 - num2;                if (sum==input) {                    System.out.println("正确");                    rightNum++;                } else {                    System.out.println("错误");                    wrongNum++;                }                System.out.println("正确答案是:" + sum);            }else if (opes.equals("*")) { // 进行乘法运算                System.out.print(num1 + "*" +num2 + "=");                int input = scan.nextInt();                int sum = num1 * num2;                if (sum==input) {                    System.out.println("正确");                    rightNum++;                } else {                    System.out.println("错误");                    wrongNum++;                }                System.out.println("正确答案是:" + sum);            }else {                     // 进行除法运算                System.out.print(num1 + "/" + num2 + "=");                int input = scan.nextInt();                int sum = num1 / num2;                if (sum==input) {                    System.out.println("回答正确");                    rightNum++;                } else {                    System.out.println("回答错误");                    wrongNum++;                }            }        }        System.out.println("做对" + rightNum + "题");        System.out.println("做错" + wrongNum + "题");    }}

4.输出结果

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【第一周】四则运算