设计思想：
把整数和真分数进行分类，在每个分类下进行输入题目量、数值范围、是否有乘除法、加减法是否有负数、除法是否有余数的操作。
在整数下定义两个随机数，在真分数下定义四个随机数。
如果有乘除法，加减法有负数，除法有余数就直接输出题目。
如果无乘除法，那么输出的结果就只有加减法的题目。
源程序代码：
package test;
import java.util.Random;
import java.util.Scanner;
public class yunsuan {
public static void main(String[] args) {
// TODO Auto-generated method stub
int a,b,c,m,n,x,min,max;
Scanner sc = new Scanner(System.in);
System.out.println("请选择整数还是真分数(整数输入1.真分数输入2)：");
x = sc.nextInt();
if(x==1){
System.out.println("请输入要打印题目的数量：");
m = sc.nextInt();
System.out.println("请输入数值的范围(最小值和最大值)：");
min = sc.nextInt();
max = sc.nextInt();
System.out.println("请输入是否有乘除法：（有输入1.反之输入2）");
a = sc.nextInt();
System.out.println("请输入加减法是否有负数：（有输入1.反之输入2）");
b = sc.nextInt();
System.out.println("请输入除法是否有余数：（有输入1.反之输入2）");
c = sc.nextInt();
sc.close();
if(a==1)//有乘除法
{
if(b==1)//有乘除法。加减法有负数
{
if(c==1)//有乘除法。加减法有负数。除法有余数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
if(num==1)
System.out.print(firstnum+" + "+secondnum+" = ");
if(num==2)
System.out.print(firstnum+" - "+secondnum+" = ");
if(num==3)
System.out.print(firstnum+" * "+secondnum+" = ");
if(num==4)
System.out.print(firstnum+" / "+secondnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
if(c==2)//有乘除法。加减法有负数。除法无余数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
if(num==1)
System.out.print(firstnum+" + "+secondnum+" = ");
if(num==2)
System.out.print(firstnum+" - "+secondnum+" = ");
if(num==3)
System.out.print(firstnum+" * "+secondnum+" = ");
if(num==4){
if(firstnum%secondnum!=0)
{
i=i-1;
}
else{System.out.print(firstnum+" / "+secondnum+" = ");}
}
if(i%5==0){
System.out.println();
}
}
}
}
if(b==2)//有乘除法。加减法无负数
{
if(c==1)//有乘除法。加减法无负数。除法有余数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
if(num==1)
System.out.print(firstnum+" + "+secondnum+" = ");
if(num==2)
{
int l;
l=firstnum-secondnum;
if(l<0){
i=i-1;
}
if(l>=0){
System.out.print(firstnum+" - "+secondnum+" = ");
}
}
if(num==3)
System.out.print(firstnum+" * "+secondnum+" = ");
if(num==4)
System.out.print(firstnum+" / "+secondnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
if(c==2)//有乘除法。加减法无负数。除法无余数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
if(num==1)
System.out.print(firstnum+" + "+secondnum+" = ");
if(num==2)
{
int l;
l=firstnum-secondnum;
if(l<0){
i=i-1;
}
if(l>=0){
System.out.print(firstnum+" - "+secondnum+" = ");
}
}
if(num==3)
System.out.print(firstnum+" * "+secondnum+" = ");
if(num==4){
if(firstnum%secondnum!=0)
{
i=i-1;
}
else{System.out.print(firstnum+" / "+secondnum+" = ");}
}
if(i%5==0){
System.out.println();
}
}
}
}
}
if(a==2)//无乘除法
{
if(b==1)//没有乘除法，加减法有负数
{
if(c==1||c==2){
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(2)+1;
if(num==1)
System.out.print(firstnum+" + "+secondnum+" = ");
if(num==2)
System.out.print(firstnum+" - "+secondnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
}
if(b==2)//没有乘除法，加减法无负数
{
if(c==1||c==2){
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int num = rand.nextInt(2)+1;
if(num==1){
System.out.print(firstnum+" + "+secondnum+" = ");}
if(num==2)
{
int l;
l=firstnum-secondnum;
if(l<0){
i=i-1;
}
if(l>=0){
System.out.print(firstnum+" - "+secondnum+" = ");
}
}
if(i%5==0){
System.out.println();
}
}
}
}
}
}
if(x==2){
System.out.println("请输入要打印题目的数量：");
m = sc.nextInt();
System.out.println("请输入数值的范围(最小值和最大值)：");
min = sc.nextInt();
max = sc.nextInt();
System.out.println("请输入是否有乘数法：（有输入1.反之输入2）");
a = sc.nextInt();
System.out.println("请输入加减法是否有负数：（有输入1.反之输入2）");
b = sc.nextInt();
sc.close();
if(a==1)//有乘除法
{
if(b==1)//有乘除法，加减法有负数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int thirdnum = rand.nextInt(max)+min;
int fourthnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
int flag = 0;
if(firstnum>secondnum){
int temp;
temp = firstnum;
firstnum = secondnum;
secondnum = temp;
}
if(thirdnum>fourthnum){
int temp;
temp = thirdnum;
thirdnum = fourthnum;
fourthnum = temp;
}//如果分子大于分母，则分子分母交换位置
if(firstnum==secondnum&&thirdnum==fourthnum){
flag=1;
}
if(firstnum==secondnum&&thirdnum!=fourthnum){
flag=1;
}
if(firstnum!=secondnum&&thirdnum==fourthnum){
flag=1;
}
if(flag==1){
i=i-1;
}//如果分子分母相等，则重新生成
else{
if(num==1)
System.out.print(firstnum+"/"+secondnum+" + "+thirdnum+"/"+fourthnum+" = ");
if(num==2)
System.out.print(firstnum+"/"+secondnum+" - "+thirdnum+"/"+fourthnum+" = ");
if(num==3)
System.out.print(firstnum+"/"+secondnum+" * "+thirdnum+"/"+fourthnum+" = ");
if(num==4)
System.out.print(firstnum+"/"+secondnum+" / "+thirdnum+"/"+fourthnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
}
if(b==2)//有乘除法，加减法无负数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int thirdnum = rand.nextInt(max)+min;
int fourthnum = rand.nextInt(max)+min;
int num = rand.nextInt(4)+1;
int flag=0;
if(firstnum>secondnum){
int temp;
temp = firstnum;
firstnum = secondnum;
secondnum = temp;
}
if(thirdnum>fourthnum){
int temp;
temp = thirdnum;
thirdnum = fourthnum;
fourthnum = temp;
}
if(firstnum==secondnum&&thirdnum==fourthnum){
flag=1;
}
if(firstnum==secondnum&&thirdnum!=fourthnum){
flag=1;
}
if(firstnum!=secondnum&&thirdnum==fourthnum){
flag=1;
}
if(flag==1){
i=i-1;
}
else{
if(num==1)
System.out.print(firstnum+"/"+secondnum+" + "+thirdnum+"/"+fourthnum+" = ");
if(num==2)
{
int l;
l=firstnum/secondnum-thirdnum/fourthnum;
if(l<0){
i=i-1;
}
if(l>=0){
System.out.print(firstnum+"/"+secondnum+" - "+thirdnum+"/"+fourthnum+" = ");
}
}
if(num==3)
System.out.print(firstnum+"/"+secondnum+" * "+thirdnum+"/"+fourthnum+" = ");
if(num==4)
System.out.print(firstnum+"/"+secondnum+" / "+thirdnum+"/"+fourthnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
}
}
if(a==2)//无乘除法
{
if(b==1)//没有乘除法，加减法有负数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int thirdnum = rand.nextInt(max)+min;
int fourthnum = rand.nextInt(max)+min;
int num = rand.nextInt(2)+1;
int flag=0;
if(firstnum>secondnum){
int temp;
temp = firstnum;
firstnum = secondnum;
secondnum = temp;
}
if(thirdnum>fourthnum){
int temp;
temp = thirdnum;
thirdnum = fourthnum;
fourthnum = temp;
}
if(firstnum==secondnum&&thirdnum==fourthnum){
flag=1;
}
if(firstnum==secondnum&&thirdnum!=fourthnum){
flag=1;
}
if(firstnum!=secondnum&&thirdnum==fourthnum){
flag=1;
}
if(flag==1){
i=i-1;
}
else{
if(num==1)
System.out.print(firstnum+"/"+secondnum+" + "+thirdnum+"/"+fourthnum+" = ");
if(num==2)
System.out.print(firstnum+"/"+secondnum+" - "+thirdnum+"/"+fourthnum+" = ");
if(i%5==0){
System.out.println();
}
}
}
}
if(b==2)//无乘除法，加减法无负数
{
for(int i=0;i<m;i++)
{
Random rand = new Random();
int firstnum = rand.nextInt(max)+min;
int secondnum = rand.nextInt(max)+min;
int thirdnum = rand.nextInt(max)+min;
int fourthnum = rand.nextInt(max)+min;
int num = rand.nextInt(2)+1;
int flag=0;
if(firstnum>secondnum){
int temp;
temp = firstnum;
firstnum = secondnum;
secondnum = temp;
}
if(thirdnum>fourthnum){
int temp;
temp = thirdnum;
thirdnum = fourthnum;
fourthnum = temp;
}
if(firstnum==secondnum&&thirdnum==fourthnum){
flag=1;
}
if(firstnum==secondnum&&thirdnum!=fourthnum){
flag=1;
}
if(firstnum!=secondnum&&thirdnum==fourthnum){
flag=1;
}
if(flag==1){
i=i-1;
}
else{
if(num==1)
System.out.print(firstnum+"/"+secondnum+" + "+thirdnum+"/"+fourthnum+" = ");
if(num==2)
{
int l;
l=firstnum/secondnum-thirdnum/fourthnum;
if(l<0){
i=i-1;
}
if(l>=0){
System.out.print(firstnum+"/"+secondnum+" - "+thirdnum+"/"+fourthnum+" = ");
}
}
if(i%5==0){
System.out.println();
}
}
}
}
}
}
}
}
运行结果截图：
实验总结：
首先，没有完整的完成实验，其中本程序并没有完成“是否有括号”这个参数，本程序只能单纯的输出题目还不能进行答案验证，还需后续的修改。其中我觉得比较有难度的是关于真分数部分真分数的设置，真分数为分子小于分母的分数。还有就是我定义的分子分母是int类型的，不知道有没有错误。待改进。
时间： 2024-09-29 08:49:49