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Both statements will return the fifth element Remember, arrays start at 0 To access the fifth element, you must use 4 to index str You also add 4 to the pointer p1 to access the fifth element because p1 currently points to the first element of str (Recall that an array name without an index returns the starting address of the array, which is the address of the first element) The preceding example can be generalized In essence, C/C++ provides two methods of accessing array elements: pointer arithmetic and array indexing Although the standard array-indexing notation is sometimes easier to understand, pointer arithmetic can be faster Since speed is often a consideration in programming, C/C++ programmers commonly use pointers to access array elements These two versions of putstr( ) one with array indexing and one with pointers illustrate how you can use pointers in place of array indexing The putstr( ) function writes a string to the standard output device one character at a time

Sec 3-6

In a multiring le all records will have similar structures, but their contents and size will be a function of the rings to which they belong A multiring le may have a considerable number of distinct record categories We note here a violation of the earlier de nition of a le: The records now are not identical in format, and ring membership as well as le membership has to be known before processing

EXAMPLE (Oracle)

/* Index s as an array */ void putstr(char *s) { register int t; for(t=0; s[t]; ++t) putchar(s[t]); }

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Record Formats The precise format of a record depends on the combination of ring types of which the record is a member The attribute-value pairs could be self-identifying, as seen in the pile le; but typically they are not, and each record will have a record-type identi er In Fig 3-33 the eld, t, identi es this record as being an employee record Each record of type t will have similar data elds and seven pointer elds This identi er will allow reference to an appropriate record format description, stored with the general description of the le To link the records into their rings, many pointers will appear in a typical record A record can belong to as many rings as it has pointers A given pointer position in the record format is assigned to a speci c category of rings In the example above, profession may be such a category and welder one speci c ring of that category If an instance of a record is not a member of a certain category ring, there will be an unused pointer eld containing a NULL entry ( ), as shown in Fig 3-33

There can also be NULL data elds, but since there are many types of records for speci c purposes the overall le will be relatively dense If all data elds are lled, and no redundant data is kept, the number of elds used is commensurate with the parameter a which was used to enumerate the number of valid attributes for a record The use of header records in fact reduces the redundancy of attributes found in les without the structure provided in the multiring le

Expressions in SELECT a n d W H E R E Clauses The t o _ c h a r function extracts the four-digit year from the FacHireDate column and the t o _ n u m b e r function converts the character representation of the year into a number

/* Access s as a pointer */ void putstr(char *s) { while(*s) putchar(*s++); }

Sec 3-6

Each ring will have a header This header is either an entry point, a member of another ring, or both The header for the ring of department employees will be the list of departments; the header for the ring of welders will be a member of the ring of professions; and the employee s record may be the header for a ring listing family members When a ring is entered during a search, the point of entry is noted so that when this point is reached again, the search can be terminated

SELECT FacFirstName, FacLastName, FacCity, FacSalary*11 AS IncreasedSalary, FacHireDate FROM Faculty WHERE to_number(to_char(FacHireDate, 'YYYY') ) > 1996

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