实现四则运算

importjava.util.Scanner;

importjavax.script.ScriptEngine;
importjavax.script.ScriptEngineManager;
importjavax.script.ScriptException;

publicclasshh{

publicstaticvoidmain(String[]args){
for(intk1=0;k1<100;k1++){
ScriptEngineManagersem=newScriptEngineManager();
ScriptEngineengine=sem.getEngineByExtension("js");//计算方法

Scannerin=newScanner(System.in);

Stringl;
intk=0;
inty=0;
inta1,a2,a3,a4;
Stringl1,l2,l3;
inta=Integer.parseInt(args[0]);
for(inti=0;i<a;i++){
l="";
intb=0;
Strings=null;
intx=1+(int)(Math.random()*9);
intx2=(int)(Math.random()*4);
switch(x2){
case0:s="-";break;
case1:s="+";break;
case2:s="*";break;
case3:s="/";break;
}
l1=s;
intx3=1+(int)(Math.random()*9);
l=l+x+s+x3;
intx4=(int)(Math.random()*4);
switch(x4){
case0:s="-";break;
case1:s="+";break;
case2:s="*";break;
case3:s="/";break;
}
l2=s;
intx5=1+(int)(Math.random()*9);
l=l+s+x5;
intx6=(int)(Math.random()*4);
switch(x6){
case0:s="-";break;
case1:s="+";break;
case2:s="*";break;
case3:s="/";break;
}
l3=s;
intx7=1+(int)(Math.random()*9);
l=l+s+x7;
a1=x;
a2=x3;
a3=x5;
a4=x7;
System.out.println(l);//产生随机题目

if(l1.equals("/")&&l3.equals("/")){
if(l2.equals("+")||l2.equals("-")){
l="("+a1+"*"+a4+"+"+a2+"*"+a3+")"+"/"+"("+a3+"*"+a4+")"+"";
}elseif(l2.equals("*")){
l="("+a1+"*"+a3+")"+"/"+"("+a2+"*"+a4+")"+"";
}else{
l=a1+"/"+"("+a2+"*"+a3+"*"+a4+")"+"";
}
}
if(l1.equals("/")&&!l3.equals("/")){
if(l2.equals("*")&&l3.equals("+")){
l=a1+"*"+a3+"/"+a2+l3+a4;
}if(l2.equals("*")&&l3.equals("-")){
l="("+a1+l2+a3+l3+a4+l2+a2+")"+l1+a2;
}
if(l2.equals("/")&&l3.equals("*")){
l=a1+l3+a4+l2+"("+a2+"*"+a3+")";
}if(l2.equals("/")&&l3.equals("+")){
l=a1+l1+"("+a2+"*"+a3+")"+l3+a4;
}if(l2.equals("/")&&l3.equals("-")){
l="("+a1+l3+a4+"*"+a2+"*"+a3+")"+l1+"("+a2+"*"+a3+")";
}if(l2.equals("-")&&l3.equals("*")){
l="("+a1+l2+"("+a3+l3+a4+")"+"*"+a2+")"+l1+a2;
}
}
if(l2.equals("/")){
if(l1.equals("-")&&l3.equals("*")){
l="("+a1+l3+a3+l1+a2+l3+a4+")"+l2+a3;
}if(l1.equals("-")&&l3.equals("/")){
l="("+a1+"*"+a3+"*"+a4+l1+a2+")"+l2+a3+"*"+a4;
}if(l1.equals("-")&&l3.equals("+")){
l="("+a1+"*"+a3+l1+a2+")"+l2+a3+l3+a4;
}if(l1.equals("-")&&l3.equals("-")){
l="("+"("+a1+l3+a4+")"+"*"+a3+l1+a2+")"+l2+a3;
}if(l1.equals("*")&&l3.equals("-")){
l="("+a1+l1+a2+l3+a3+l1+a4+")"+l2+a3;
}if(l1.equals("/")&&l3.equals("-")){
l="("+a1+l3+a2+"*"+a3+"*"+a4+")"+l2+"("+a2+"*"+a3+")";
}if(l1.equals("+")&&l3.equals("-")){
l="("+"("+a1+l3+a4+")"+"*"+a3+l1+a2+")"+l2+a3;
}
}
if(l3.equals("/")){
if(l1.equals("-")&&l2.equals("*")){
l="("+a1+l2+a4+l1+a2+l2+a4+")"+l3+a4;
}if(l1.equals("-")&&l2.equals("-")){
l="("+a1+"*"+a4+l1+a2+"*"+a4+")"+l3+a4;
}if(l1.equals("-")&&l2.equals("+")){
l="("+a1+"*"+a4+l1+a2+"*"+a4+")"+l3+a4;
}if(l1.equals("*")&&l2.equals("-")){
l="("+a1+l1+a2+l1+a4+l2+a3+")"+l3+a4;
}
}//除法方法的重新编写

Objectresult=null;
try{
result=engine.eval(l);

}catch(ScriptExceptione1){
e1.printStackTrace();
}
Objectresult1=null;
System.out.println("请输入你的答案");
Stringn=in.next();
try{
result1=engine.eval(n);
}catch(ScriptExceptione){
System.out.println("你输入的答案有误");
System.out.println("请输入你的答案");
Stringn1=in.next();
try{
result1=engine.eval(n1);
}catch(ScriptExceptione1){
System.out.println("请不要乱输入");
System.out.println("请输入你的答案");
Stringn2=in.next();
try{
result1=engine.eval(n2);
}catch(ScriptExceptione2){
System.out.println("最后一次输入");
System.out.println("请输入你的答案");
Stringn3=in.next();
try{
result1=engine.eval(n3);
}catch(ScriptExceptione3){
break;
}
}
}
}//对输入有异常的进行处理

if(result1.equals(result)){
System.out.println("输入正确");
System.out.println(result);
k=k+1;
}else{
System.out.println("输入不正确");
System.out.println(result);
y=y+1;
}
}//判断对错，并且统计数目

System.out.println("你答对"+k+"题目;"+""+"你答错"+y+"题目");
}

}
}

Objectresult1=null;
System.out.println("请输入你的答案");
Stringn=in.next();
try{
result1=engine.eval(n);
}catch(ScriptExceptione){
System.out.println("你输入的答案有误");
System.out.println("请输入你的答案");
Stringn1=in.next();
try{
result1=engine.eval(n1);
}catch(ScriptExceptione1){
System.out.println("请不要乱输入");
System.out.println("请输入你的答案");
Stringn2=in.next();
try{
result1=engine.eval(n2);
}catch(ScriptExceptione2){
System.out.println("最后一次输入");
System.out.println("请输入你的答案");
Stringn3=in.next();
try{
result1=engine.eval(n3);
}catch(ScriptExceptione3){
break;
}
}
}
}