related records insert for loop

Hi,

Please use this standard code.

Accounnt acc = new Account();
acc.name = 'Samurai'; 
acc.employees = 20; 
insert acc;
List<Case> caseList=new List<Case>();
List<Opportunity> OpportunityList=new List<Opportunity>();
if (acc.id != null){
 system.debug(acc.id);    
  for (integer counter = 1 ; counter <= 5; counter++) { 
  case cs = new case ();
  cs.origin = 'Phone'; 
  cs.status = 'high';
  cs.accountid = cs.id;
  caseList.add(cs);
    }
	insert caseList;
	for(Integer i=0;i<5;i++){
	if(caseList[i].Id !=null){
	Opportunity opp = new Opportunity ();  
    opp.Name = 'Salman'; 
    opp.closedate = system.today();
     opp.stage = 'prospecting';  
      opp.accountid=acc.id;
	  OpportunityList.add(opp);
	}
	}
	insert OpportunityList;
}

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Thank You