九月二十七日

将四则运算的代码重新写了一遍

考虑到后期连接数据库，没有考虑错题本

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import java.util.Scanner;   public class Main {     public static void main(String[] args)     {           Scanner cin = new Scanner(System.in);           System.out.println("*******************");         System.out.println("1、 小学二年级");         System.out.println("2、 小学三年级");         System.out.println("3、 小学四年级");         System.out.println("4、 退出");         System.out.println("*******************");           int n = cin.nextInt();           int n1;         int n2;         boolean n3;         boolean n4;           switch (n)         {             case 1:                 n1 = Set_parameters.f1();                 n3 = Set_parameters.f3();                   calculation2.calculation(n1,n3);                   break;             case 2:                 n1 = Set_parameters.f1();                 n2 = Set_parameters.f2();                 n3 = Set_parameters.f3();                   calculation3.calculation(n1,n2,n3);                       break;             case 3:                 n1 = Set_parameters.f1();                 n2 = Set_parameters.f2();                 n3 = Set_parameters.f3();                 n4 = Set_parameters.f4();                   calculation4.calculation(n1,n2,n3,n4);                   break;               case 4:                 return;             }       } }

　　运用了很多类，开始的代码并没有用，所以重新写了一遍

明天考虑数据库