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1、Secondary pointerSecondary pointer7.6We have learned about the pointers that point to the memory in which the datastored are non-pointer type.Such a pointer is called a first level pointer.Pointer variable is also a type of variable,which means after defining a pointervariable,system memory is also
2、allocated for storing it.Thus,we can define anotherpointer to the memory corresponding to the first level pointer variable,which is calledthe secondary pointer,or pointer to pointer.Secondary pointer7.6The definition syntax for a secondary pointer variable is:DataType*VariableName;For example:int*pi
3、nt*pp=&p；Secondary pointer7.6EgUsing secondary pointerint main()int i,j,a2=1,2,3,4,5,6;int*p3;int*pp;for(i=0;i3;i+)pi=ai;/Equivalent to pi=&ai0;pp=p;/Equivalent to pp=&p0;Secondary pointer7.6EgUsing secondary pointerfor(i=0;i3;i+)for(j=0;j2;j+)cout*(*(pp+i)+j);/Equivalent to coutppij coutendl;return 0;Secondary pointer7.6Memory data of pp(Stores the starting address of p,i.e.the address of the first element of p)Memory data of p(Each cell represents an address,i.e.the starting address of element ai0)Memory data of a(Each cell represents 4 bytes)123456a00a01a10a11a20a21p0p1p2+0+1+2