main( ) { static int a[ ] = {0,1,2,3,4}; int *p[ ] = {a,a+1,a+2,a+3,a+4}; int **ptr = p; ptr++; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); *ptr++; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); *++ptr; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); ++*ptr; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); } ,Java, C ,C++, ASP, ASP.net C# ,Struts ,Questions & Answer, Struts2, Ajax, Hibernate, Swing ,JSP , Servlet, J2EE ,Core Java ,Stping, VC++, HTML, DHTML, JAVASCRIPT, VB ,CSS, interview ,questions, and answers, for,experienced, and fresher ```main( ) { static int a[ ] = {0,1,2,3,4}; int *p[ ] = {a,a+1,a+2,a+3,a+4}; int **ptr = p; ptr++; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); *ptr++; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); *++ptr; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); ++*ptr; printf("\n %d %d %d", ptr-p, *ptr-a, **ptr); } ``` ``` 111 222 333 344 Let us consider the array and the two pointers with some address a 0 1 2 3 4 100 102 104 106 108 p 100 102 104 106 108 1000 1002 1004 1006 1008 ptr 1000 2000 After execution of the instruction ptr++ value in ptr becomes 1002, if scaling factor for integer is 2 bytes. Now ptr � p is value in ptr � starting location of array p, (1002 � 1000) / (scaling factor) = 1, *ptr � a = value at address pointed by ptr � starting value of array a, 1002 has a value 102 so the value is (102 � 100)/(scaling factor) = 1, **ptr is the value stored in the location pointed by the pointer of ptr = value pointed by value pointed by 1002 = value pointed by 102 = 1. Hence the output of the firs printf is 1, 1, 1. After execution of *ptr++ increments value of the value in ptr by scaling factor, so it becomes1004. Hence, the outputs for the second printf are ptr � p = 2, *ptr � a = 2, **ptr = 2. After execution of *++ptr increments value of the value in ptr by scaling factor, so it becomes1004. Hence, the outputs for the third printf are ptr � p = 3, *ptr � a = 3, **ptr = 3. After execution of ++*ptr value in ptr remains the same, the value pointed by the value is incremented by the scaling factor. So the value in array p at location 1006 changes from 106 10 108,. Hence, the outputs for the fourth printf are ptr � p = 1006 � 1000 = 3, *ptr � a = 108 � 100 = 4, **ptr = 4. ```