package myproject2;
import java.util.*;
import java.lang.Math;
public class RandomCommon {
public static char operator(int n,int se) {
char op=' ';
Random random = new Random();
n = random.nextInt(100);
if(se==1)
{
switch(n%4)
{
case 0:op = '+';break;
case 1:op = '-';break;
case 2:op = '*';break;
case 3:op = '/';break;
}
}
if(se==2)
{
switch(n%2)
{
case 0:op = '+';break;
case 1:op = '-';break;
}
}
return op;
}
public static String chachong(String str,int min,int max,int sumoperand,int chengchu)
{
String []arr = new String[1000];
int count=0;
arr[count]=problem( str, min, max, sumoperand, chengchu);
if(count==0)
{
count++;
return arr[0];
}
else
{
boolean flag = true;
for (int j = 0; j <count; j++)
{
if( arr[count]== arr[j]) flag = false;
}
if(flag)
{
count++;
return arr[count];
}
else
{
return chachong(str,min,max,sumoperand,chengchu);
}
}
}
public static void main(String[] args) {
int sumtitle;//出题个数
int sumoperand;//操作数个数
int min,max;
int chengchu;
Scanner sc = new Scanner(System.in);
System.out.println("请输入出题个数:");
sumtitle = sc.nextInt();
System.out.println("请输入操作数个数：");
sumoperand = sc.nextInt();
System.out.println("请输入任意数范围：");
System.out.println("min=");
min = sc.nextInt();
System.out.println("max=");
max = sc.nextInt();
System.out.println("是否需要乘除法：1.需要 2.不需要");
chengchu = sc.nextInt();
sc.close();
String[] str = new String[sumtitle];
String str0;
Random random = new Random();
for(int i=0;i<sumtitle;i++)
{
int a = (int)(Math.random()*(max-min)+min);
int b = (int)(Math.random()*(max-min)+min);
int cc = random.nextInt(100);
char c = operator(cc,chengchu);
str0 = ""+a+c+b;
str[i] = problem(str0,min,max,sumoperand,chengchu);
}
for(int i=0;i<sumtitle;i++)
{
System.out.println(str[i]+"\n");
}
}
public static String problem(String str,int min,int max,int sumoperand,int chengchu) {
Random random = new Random();
int b = random.nextInt(100);
for(int i=2;i<sumoperand;i++)
{
int addnumber = (int)(Math.random()*(max-min)+min);
char c = operator(b,chengchu);
Random r=new Random();
int kuohao=r.nextInt(99);
switch(kuohao%2)
{
case 0:str ="("+str+c+addnumber+")";break;
case 1:str=str+c+addnumber;break;
}
}
return str;
}
}
