1+2+34-5+67-8+9=100？
package com.gch.test02;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.TreeSet;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* 编写一个在1、2、3。。。9(顺序不能变)数字之间插入+或－ 或者什么都不插入，使得计算结果总是100的程序
* 并+输出所有的可能性。例如：1+2+34-5+67-8+9=100 -@author 华
*
*/
public class Test02 {
static ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
public static void main(String[] args) {
Set set = new TreeSet();
int num=10000;//随机次数
while(true){
num--;
StringBuffer sb = new StringBuffer();
sb.append("1").append(g());
sb.append("2").append(g());
sb.append("3").append(g());
sb.append("4").append(g());
sb.append("5").append(g());
sb.append("6").append(g());
sb.append("7").append(g());
sb.append("8").append(g());
sb.append("9");
int sum = 0;
try {
Object o = jse.eval(sb.toString());
double d_num = Double.parseDouble(o.toString());
if (d_num > 99 || d_num < 101) {
sum = (int) d_num;
}
} catch (Exception t) {
continue;
}
if (sum == 100) {
String string =sb.toString() + "=100";
if(!set.contains(string)){
set.add(string);
}
}
sb.delete(0, sb.length());
if(num==0){
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
break;
}
}
}
public static String g() {
int num = new Random().nextInt(3);
return num == 0 ? "+" : (num == 1 ? "-" : "");
}
}
==========================================================
package com.gch.test02;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* 编写一个在1、2、3。。。9(顺序不能变)数字之间插入+或－ 或者什么都不插入，使得计算结果总是100的程序
* 并+输出所有的可能性。例如：1+2+34-5+67-8+9=100 -@author 华
*
*/
public class Test03 {
static ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
public static void main(String[] args) {
// 组装字符串所有可能的字符串
StringBuffer sb = new StringBuffer("");
for (int a1 = 0; a1 < 3; a1++) {
for (int a2 = 0; a2 < 3; a2++) {
for (int a3 = 0; a3 < 3; a3++) {
for (int a4 = 0; a4 < 3; a4++) {
for (int a5 = 0; a5 < 3; a5++) {
for (int a6 = 0; a6 < 3; a6++) {
for (int a7 = 0; a7 < 3; a7++) {
for (int a8 = 0; a8 < 3; a8++) {
// =======================1====================
sb.append("1");
sb.append(r_p(a1));
// =======================2====================
sb.append("2");
sb.append(r_p(a2));
// =======================3====================
sb.append("3");
sb.append(r_p(a3));
// =======================4====================
sb.append("4");
sb.append(r_p(a4));
// =======================5====================
sb.append("5");
sb.append(r_p(a5));
// =======================6====================
sb.append("6");
sb.append(r_p(a6));
// =======================7====================
sb.append("7");
sb.append(r_p(a7));
// =======================8====================
sb.append("8");
sb.append(r_p(a8));
// =======================9====================
sb.append("9");
int sum = 0;
try {
Object o = jse.eval(sb.toString());
double d_num = Double.parseDouble(o.toString());
if (d_num > 99 || d_num < 101) {
sum = (int) d_num;
}
} catch (Exception t) {
continue;
}
if (sum == 100) {
System.out.println(sb.toString() + "=100");
}
sb.delete(0, sb.length());
}
}
}
}
}
}
}
}
}
public static String r_p(int num){
String str="";
if (num == 0) {
str="+";
} else if (num == 1) {
str="-";
}
return str;
}
}
=================================================================================
import java.util.ArrayList;
import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* 编写一个在1、2、3。。。9(顺序不能变)数字之间插入+或－ 或者什么都不插入，使得计算结果总是100的程序
* 并+输出所有的可能性。例如：1+2+34-5+67-8+9=100 -@author 华
* 18种
123-45-67+89=100
123-4-5-6-7+8-9=100
123+45-67+8-9=100
123+4-5+67-89=100
12-3-4+5-6+7+89=100
12+34-5+67-8=100
12+3-4+5+67+8+9=100
12+3-4+5+6+78=100
12+3+4+5-6-7+89=100
1-2-3+45+67-8=100
1-2+34-5-6+78=100
1+23-4+56+7+8+9=100
1+23-4+5+67+8=100
1+23-4+5+6+78-9=100
1+23+4+5+67=100
1+2+34-5+67-8+9=100
1+2+34+56+7=100
1+2+3-4+5+6+78+9=100
*/
public class Test04 {
static ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
public static void main(String[] args) {
List list=new ArrayList();
int num_=Integer.parseInt(Three2Ten("22222222"));
for (int j = 0; j <= num_; j++) {
String t2t=Ten2Three(j);
StringBuffer sb=new StringBuffer();
String[] lable=new String[9];//012
String[] num={"1","2","3","4","5","6","7","8","9"};//1-9
lable=t2t.split("");
for(int i=0;i<9;i++){
sb.append(num[i]);
if(i<8){
if(lable[i+1].equals("0")){
sb.append("");
}else if(lable[i+1].equals("1")){
sb.append("-");
}else{
sb.append("+");
}
}
int sum = 0;
try {
Object o = jse.eval(sb.toString());
double d_num = Double.parseDouble(o.toString());
if (d_num > 99 || d_num < 101) {
sum = (int) d_num;
}
} catch (Exception t) {
continue;
}
if (sum == 100) {
String s=sb.toString() + "=100";
if(!list.contains(s)){
list.add(s);
}
}
}
}
System.out.println(list.toString());
}
/*
* 定义十进制转三进制
*/
public static String Ten2Three(int i){
int[] x = new int[8];
if (i >= 0 && i <= 1000000000) {
for (int j = 0; j < x.length; j++) {
x[j] = i % 3;
i = i / 3;
}
}else {
System.out.println("The number is wrong!");
}
return toStr(x);
}
/*
* 定义三进制转十进制
*/
public static String Three2Ten(String str){
String[] array=new String[9];
array=str.split("");
int sum=0;
for(int i=1;i<9;i++){
String si=array[i];
int int_=Integer.parseInt(si);
double pow_sum =Math.pow(3,8-i);
sum+=int_*pow_sum;
//System.out.println(i+"---------------si："+si+"---------------int_："+int_+"---------------pow_sum："+pow_sum+"---------------sum："+sum);
}
return sum+"";
}
/*
* 逆序组装输出数组
*/
public static String toStr(int[] ii) {
StringBuffer sb=new StringBuffer();
for (int j = ii.length-1; j >= 0; j--) {
sb.append(ii[j]);
}
return sb.toString();
}
}