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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<form method = "post" action = "fourArithmeticOperation.php">
简单四则运算 <input type = "submit" name = "continue" value = "简单四则运算"></form>
<form method = "post" action = "multitermOperation.php">
多项运算 <input type = "submit" name = "continue" value = "多项运算"></form>
<?php
if(isset($_REQUEST["continue"]))
{
}
?>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset = "UTF-8">
<title></title>
</head>
<form method = "get" action = "fourArithmeticOperation.php">
简单四则运算 <br>
习题数量 <input type = "text" name = "test1" > <br>
数值范围 <input type = "text" name = "test2" > <br>
<input type = "submit"></form>
<body>
<?php
if(isset($_REQUEST["test1"]) && (isset($_REQUEST["test2"])))
{
$open1 = fopen("config.txt","w+" ); //config.txt用于存放用户在表单输入的参数。
fwrite($open1,$_REQUEST["test1"]."\r\n".$_REQUEST["test2"]);
fclose($open1);
$open2 = fopen("time.txt","w+" ); //time.txt用于更新用户当前答题数量。
fwrite($open2,"0");
fclose($open2);
$open3 = fopen("exercise.txt","w+" ); //exercise.txt用于存放本次程序所出试题，同时用于判断是否有重复。
fclose($open3);
header("Refresh:0;url = main.php"); //配置完成后跳转到主程序页面。
}
?>
</body>
</html>
<?PHP
static $flag = true; //用于标记是否出题，逻辑上的变量。
$open0 = file("config.txt");
$range = chop($open0[1]); //读取随机数大小上限。
if(!(isset($_REQUEST["answer"])) && $flag) //出现回答后不再运行。
{
include("exercise.php");
$object = new exercise();
$object->randomNumber($range);
$flag = false;
}
$open1 = fopen("exercise.txt",‘r‘); //读取exercise.txt的最后一行数据，即当前试题。
while($buf = fgets($open1))
{
$res = $buf;
}
fclose($open1);
echo $res;
if(isset($_REQUEST["answer"])) //输出答案和输入结果。
{
echo file_get_contents("result.txt")."<br>"."您的结果为：".$_REQUEST["answer"]."<br>";
}
else
{
?>
<form method = "post">
<input type = "text" name = "answer"><br>
<input type = "submit"></form>
<?PHP
}
if(isset($_REQUEST["answer"])) //输入结果后进行判断。
{
judge($_REQUEST["answer"]);
}
function judge($answer)
{
$result = file_get_contents("result.txt");
if($result == $answer)
{
echo "结果正确 ";
}
else
{
echo "结果错误 ";
}
$open2 = file("config.txt");
$timeMax = chop($open2[0]); //读取习题数量。
$open3 = file("time.txt");
$time = chop($open3[0]); //读取当前为第几题。
if($time < $timeMax - 1) //习题未出完时，当前题数加一，更新time.txt，重新运行main.txt
{
echo "(第".($time + 1)."/".($timeMax)."题)";
$time++;
$open3 = fopen("time.txt","w+" );
fwrite($open3,"$time");
fclose($open3);
?>
<form method = "post" action = "main.php">
<input type = "submit" value = "下一题"></form>
<?PHP
}
else //否则跳转到退出界面。
{
echo "答题完毕。";
header("Refresh:3;url = quit.php");
}
}
<?PHP
class exercise
{
public $numberA;
public $numberB;
public $numberC;
public $result;
public function exercise()
{
$this->numberA = null;
$this->numberB = null;
$this->result = null;
}
public function randomFormula($a)
{
$symbolA = rand(0,3);
$symbolB = rand(0,3);
$this->numberA = rand(0,$a);
$this->numberB = rand(0,$a);
$this->numberC = rand(0,$a);
$openA = fopen("exercise.txt","a" );
$openB = fopen("result.txt","w+" );
fwrite($openA,$this->numberA.symbol($symbolA).$this->numberB.symbol($symbolB).$this->numberC." = "."\r\n");
$this->result = 0;
fwrite($openB,$this->result);
fclose($openA);
fclose($openB);
}
public function randomNumber($a)
{
$case2 = "0";
$symbol = rand(0,3);
$this->numberA = rand(0,$a);
$this->numberB = rand(0,$a);
$openA = fopen("exercise.txt","a" );
$openB = fopen("result.txt","w+" );
if($symbol == 0)
{
$this->result = $this->numberA + $this->numberB;
$case1 = $this->numberA." + ".$this->numberB." = "."\r\n";
$case2 = $this->numberB." + ".$this->numberA." = "."\r\n";
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." + ".$this->numberB." = "."\r\n");
}
}
if($symbol == 1)
{
$this->numberB = rand(0,$this->numberA);
$case1 = $this->numberA." - ".$this->numberB." = "."\r\n";
$this->result = $this->numberA - $this->numberB;
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." - ".$this->numberB." = "."\r\n");
}
}
if($symbol == 2)
{
$case1 = $this->numberA." * ".$this->numberB." = "."\r\n";
$case2 = $this->numberB." * ".$this->numberA." = "."\r\n";
$this->result = $this->numberA * $this->numberB;
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." * ".$this->numberB." = "."\r\n");
}
}
if($symbol == 3)
{
$this->numberB = rand(1,$a);
$this->numberA = rand(1,$this->numberB);
$case1 = $this->numberA." / ".$this->numberB." = "."\r\n";
$gcd = getGreatestCommonDivisor($this->numberA,$this->numberB);
$this->result = ($this->numberA / $gcd)."/".($this->numberB / $gcd);
if($this->result == "1/1")
{
$this->result = "1";
}
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." / ".$this->numberB." = "."\r\n");
}
}
fwrite($openB,$this->result);
fclose($openA);
fclose($openB);
}
}
function symbol($a)
{
$symbol = "";
switch($a)
{
case 0:
$symbol = " + ";break;
case 1:
$symbol = " - ";break;
case 2:
$symbol = " * ";break;
case 3:
$symbol = " / ";break;
}
return $symbol;
}
function isRepeat($open1,$case1,$case2)
{
while($buf = fgets($open1))
{
if($buf == $case1 || $buf == $case2)
{
header("Refresh:0;url = main.php");
return false;
}
else
{
continue;
}
}
return true;
}
function getGreatestCommonDivisor($numberA,$numberB)
{
$n = 0;
while($numberB > 0)
{
$n = $numberA % $numberB;
$numberA = $numberB;
$numberB = $n;
}
return $numberA;
}
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原文地址：http://www.cnblogs.com/shenshenxin/p/5375184.html
