CHAPTER 5 Input 4. Pointing Devices课件

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1、CHAPTER5InputPointingDevicesPointersApointerisavariableusedtostoretheaddressofamemorycell.Wecanusethepointertoreferencethismemorycell100……1024…Memoryaddress:10241032…1020integerpointerPointerTypesPointerC++haspointertypesforeachtypeofobjectPointerstointobjectsPointerstocharobjec

2、tsPointerstouser-definedobjects(e.g.,RationalNumber)EvenpointerstopointersPointerstopointerstointobjectsPointerVariableDeclarationofPointervariablestype*pointer_name;//ortype*pointer_name;wheretypeisthetypeofdatapointedto(e.g.int,char,double)Examples:int*n;RationalNumber*r;int**

3、p;//pointertopointerAddressOperator&The"addressof"operator(&)givesthememoryaddressofthevariableUsage:&variable_name100…………Memoryaddress:1024inta=100;//getthevalue,cout<

4、020b#includeusingnamespacestd;voidmain(){inta,b;a=88;b=100;cout<<"Theaddressofais:"<<&a<

5、sPointerVariables10088…1024…Memoryaddress:10241032…1020apinta=100;int*p=&a;cout<

6、errorint*p;p=0;cout<

7、alPointerUsagevoidIndirectSwap(char*Ptr1,char*Ptr2){chartemp=*Ptr1;*Ptr1=*Ptr2;*Ptr2=temp;}intmain(){chara='y';charb='n';IndirectSwap(&a,&b);cout<

8、nterconstant#includeusingnamespacestd