<apex:pageBlock Title="edit Account">

      <apex:pageMessages />
<apex:pageBlockSection Title="Information" columns="2">
<apex:inputText label="First Name" value="{!fname}" id="fname"/>
<apex:inputText label="Last Name" value="{!lname}" id="lname" html-
placeholder="{!acc.LastName}"/>
<apex:inputText label="Email" value="{!acc.Personemail}" id="email"
 html-placeholder="{!acc.personEmail}"/>

    </apex:pageBlockSection>
     <apex:commandButton Value="Save" action="{!saving}"/>
    </apex:pageBlock>

Id accId;
public Account acc     {get;set;}
public string fname    {get;set;}
public string lname    {get;set;}




public AccController() {


    accId = ApexPages.currentPage().getParameters().get('accId');

    if (accId == null) {

        acc = new Account();

        return;

    }

    acc = [select id, FirstName, LastName, BillingCity, BillingStreet,BillingPostalCode, BillingCountry, PersonEmail

                    from Account

                    where id = :accId];



   }



    public PageReference saveThis() {



        acc.FirstName = fname;
        acc.LastName = lname;
        acc.PersonEmail = acc.Personemail;

        update acc;