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两道标题和解答,求改进

WBOY
WBOY原创
2016-06-13 12:56:09796浏览

两道题目和解答,求改进
初学 php ,很多都不懂,能不能指导一下这两道题目更好的解法,谢谢

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                    a
                    

                    

                    

                

                    

                              
                    b
                    

                    

                

                                             
                    c
                    

                    

                    

                

                    

                    

                    d
                
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