存档：

index.php

1  2      3          4         
      5      6      7      8         
     
       9             
      
图形(周长&面积)计算器
10             11             
      矩形12             
      三角形13             
      圆形14         
     15         
     25     26 

form.class.php

1 
     action = $action; 7             $this->shape = isset($_GET["action"])?$_GET["action"]:"rect"; 8         } 9         10         function __toString(){11             $form='
     
      ';12             $shape="get".ucfirst($this->shape);13             $form .=$this->$shape();14             $form .='
      
      
      
';15             $form .='
     
';16             return $form;17         }18         19         private function getRect(){20             $input = '请输入|矩形|的宽度和高度:
';21             $input .= '宽度:
';22             $input .= '高度:
';23             return $input;24         }25         26         private function getTriangle(){27             $input = '请输入|三角形|的三条边:
';28             $input .= '第一条边:
';29             $input .= '第二条边:
';30             $input .= '第三条边:
';31             return $input;32         }33         34         private function getCircle(){35             $input = '请输入|圆形|的半径:
';36             $input .= '半径:
';37             return $input;38         }39     }40 ?>

shape.class.php

1 
     shapeName.$message; 9                 echo ''.$message.'必须为非负值的数字,并且不能为空
';10                 return false;11             }12             else{13                 return true;14             }15         }16     }17 ?>

result.class.php

1 
     shape = new $_GET['action'](); 6         } 7          8         function __toString(){ 9             $result = $this->shape->shapeName.'的周长:'.round($this->shape->perimeter(),2).'
';10             $result .= $this->shape->shapeName.'的面积:'.round($this->shape->area(),2).'
';11             return $result;12         }13     }14 ?>

rect.class.php

1 
     shapeName = "矩形"; 7             if($this->validate($_POST["width"],"宽度") & $this->validate($_POST["height"],"高度")){ 8                 $this->width = $_POST["width"]; 9                 $this->height = $_POST["height"];10             }11         }12         13         function area(){14             return $this->width*$this->height;15         }16         17         function perimeter(){18             return 2*($this->width+$this->height);19         }20     }21 ?>

triangle.class.php

1 
     shapeName = "三角形"; 8             if($this->validate($_POST["side1"],"第一条边") &  9                 $this->validate($_POST["side2"],"第二条边") & 10                     $this->validate($_POST["side3"],"第三条边")){11                 if($this->validateSum($_POST["side1"],$_POST["side2"],$_POST["side3"])){12                     $this->side1 = $_POST["side1"];13                     $this->side2 = $_POST["side2"];14                     $this->side3 = $_POST["side3"];15                 }16                 else{17                     echo '三角形的两边之和要大于第三边
';18                 }    19             }20         }21         22         function area(){23             $s = ($this->side1+$this->side2+$this->side3)/2;24             return sqrt($s*($s-$this->side1)*($s-$this->side2)*($s-$this->side3));25         }26         27         function perimeter(){28             return $this->side1+$this->side2+$this->side3;29         }30         31         private function validateSum($s1,$s2,$s3){32             if((($s1+$s2)>$s3) && (($s1+$s3)>$s2) && (($s2+$s3)>$s1)){33                 return true;34             }35             else{36                 return false;37             }38         }39     }40 ?>

circle.class.php

1 
     shapeName = "图形"; 6             if($this->validate($_POST['radius'],'半径')){ 7                 $this->radius = $_POST['radius']; 8             } 9         }10         11         function area(){12             return pi()*$this->radius*$this->radius;13         }14         15         function perimeter(){16             return 2*pi()*$this->radius;17         }18     }19 ?>

结果如下：