为小学生出四则运算题目.java

import java.util.Scanner;
import java.util.Random;
public class test{
	public static int  s1 = new Random().nextInt(100);
	public static int  s2 = new Random().nextInt(100);
	public static int  s3 = new Random().nextInt(100);
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		System.out.println("请输入想要的算法个数：");
		int amout = in.nextInt();
		System.out.println("请输入想要每行个数：");
		int line = in.nextInt();
		int[][] sum = new int[10000][3];
		for(int i=0;i<amout;i++) {
			if(i%line==0) {
				System.out.print("
");
			}
			s3 = new Random().nextInt(100);
			     sum[i][2]=s3;
         		s1 = new Random().nextInt(100);
  	            s2 = new Random().nextInt(100);
			if((s3%4)==0){
	            if(s2>s1){
	            	while(s2>s1) {
	            		s1 = new Random().nextInt(100);
          	            s2 = new Random().nextInt(100);
	            	}
	    			}
			}
			if((s3%4)==1) {
                sum[i][0]=s1;
                sum[i][1]=s2;
			}
			 if((s3%4)==2) {
	            if(s1*s2>100) {
	            	while(s1*s2>100){
	    				s1 = new Random().nextInt(100);
	    	            s2 = new Random().nextInt(100);
	    	        }
	            }
			}
			 if((s3%4)==3) {
				  while(s2==0) {
  	                s2 = new Random().nextInt(100);
  	            }
			      if(s1%s2!=0) {
			    	  while(s2==0) {
	    	                s2 = new Random().nextInt(100);
	    	            }
			    	  while(s1%s2!=0){
		    				s1 = new Random().nextInt(100);
		    	            s2 = new Random().nextInt(100);
		    	            while(s2==0) {
		    	                s2 = new Random().nextInt(100);
		    	            }
		            	}
		            }
			  }
                 sum[i][0]=s1;
                 sum[i][1]=s2;
                 if(i>1) {
    		     if(sum[i-1][0]==sum[i][0]&&sum[i-1][1]==sum[i][1]&&sum[i-1][2]%4==sum[i][2]%4) {
    			    	 do {
    			    		 sum[i][0]=new Random().nextInt(100);
    			    		 sum[i][1]=new Random().nextInt(100);
    			    		 sum[i][2]=new Random().nextInt(100);
    			    	 }while(sum[i][0]!=sum[i-1][0]&&sum[i][1]!=sum[i-1][1]&&sum[i][2]%4!=sum[i+1][2]%4);
    			     }
    		     }
    		     if(s3%4==0) {
    		    	 System.out.print(i+1 +":"+ s1 + "-" + s2 +"=  ");
    		     }
    		     if(s3%4==1) {
    		    	 System.out.print(i+1 +":"+ s1 + "+" + s2 +"=  ");
    		     }
    		     if(s3%4==2) {
    		    	 System.out.print(i+1 +":"+ s1 + "*" + s2 +"=  ");
    		     }
    		     if(s3%4==3) {
    		    	 System.out.print(i+1 +":"+ s1 + "/" + s2 +"=  ");
    		     }
		   }
        }
	 }	

　　程序设计思路：程序主要运用了Random函数产生随机数，将s3%4做为符号确定数，再在其中每一个条件中控制该运算符的相应条件。最后在用数组存入相应数据，将其进行判断。最后按照要求输出！

       设计程序可以锻炼逻辑思维能力，以后会每天坚持敲写代码，提高自己的编程能力。