Deck 10: Data Files

Question 1

In the context of data processing, a C program is not usually considered data, and the term file, or data file, is typically used to refer only to external files that contain the data used in a C program.

Answer 1

True

Question 2

The internal name is the name of a file as it is known by the operating system.

Answer 2

False

Question 3

A manageable length for a filename is 24 to 30 characters, with an outside maximum of 511 characters.

Answer 3

False

Question 4

Most C compilers require a program file to have either the extension c or cc.

Question 5

The advantage of binary files is typically speed and compactness.

Question 6

It typically takes less space to store most numbers using their binary code than as individual character values.

Question 7

A file stream that receives data from a file into a program is referred to as an input file stream.

Question 8

FILE fp; correctly declares a file stream.

Question 9

Opening a file stream establishes the physical communication link between the program and the data file.

Question 10

The file open function is called open().

Question 11

Permissible file opening modes are r, w, or p, which represent reading, writing, or appending to a file.

Question 12

The only difference between a file opened in w mode and one opened in w+ mode is where the data is physically placed in the file.

Question 13

If a file opened for reading does not exist, the fopen() function returns the NULL address value.

Question 14

The exit() function is a systems call that passes its integer argument directly to the operating system and then terminates program operation.

Question 15

It is important to check the return value when making an fopen() call because the call is really a request to the operating system to open a file.

Question 16

The fflush() function breaks the link between the file's external and internal names, releasing the internal file pointer name, which can then be used for another file.

Question 17

The maximum number of files that can be opened at one time is defined by the system symbolic constant FOPEN_MAX.

Question 18

The end-of-file sentinel is never counted as part of the file.

Question 19

The functions fgetc() and fgets() return the named constant EOF when the marker is detected.

Question 20

A logical file pointer is one that references a file of related data that has been saved under a common name; that is, it "points to" a data file.

Question 21

A physical file pointer "points to" a hardware device, such as a keyboard, screen, or printer.

Question 22

stdin and stderr frequently refer to the same device.

Question 23

Most IBM or IBM-compatible personal computers assign the name prn to the printer connected to the computer.

Question 24

The standard library functions rewind(), fseek(), and ftell() can be used to provide random access to a file.

Question 25

The function prototype for ftell() is contained in stdlib.h.

Question 26

Binary files frequently require less storage space than their character-based counterparts.

Question 27

Data that is stored together under a common name on a storage medium other than the computer's main memory is called a ____.

A)database
B)data file
C)text file
D)binary file

Question 28

The maximum allowable filename in the DOS operating system is ____.

A)8 characters plus an optional period and 3-character extension
B)14 characters
C)155 characters
D)255 characters

Question 29

The maximum allowable filename in current Unix versions is ____.

A)8 characters plus an optional period and 3-character extension
B)14 characters
C)155 characters
D)255 characters

Question 30

The maximum allowable filename in the Windows 98, 2000 and XP operating system families is ____.

A)8 characters plus an optional period and 3-character extension
B)14 characters
C)155 characters
D)255 characters

Question 31

____ files store each individual character, such as a letter, digit, dollar sign, decimal point, and so on, using an individual character code.

A)Data
B)Text
C)Binary
D)ASCII

Question 32

The standard input stream is named ____.

A)stdin
B)stdout
C)instream
D)ostream

Question 33

The standard output stream is named ____.

A)stdin
B)stdout
C)instream
D)ostream

Question 34

Naming a file stream is accomplished by declaring a variable name to be of type ____.

A)FSTREAM
B)fstream
C)FILE
D)file

Question 35

Notice that each file stream name, when it is declared, is preceded by a(n) ____.

A)pipe
B)underscore
C)ampersand
D)asterisk

Question 36

The actual declaration of the FILE structure is contained in the ____ standard header file.

A)stdio.h
B)stdlib.h
C)file.h
D)stream.h

Question 37

____ creates a new file and makes the file available for output; if a file exists with the same name, the old file is erased.

A)fileOut = fopen("prices.dat","r");
B)fileOut = fopen("prices.dat","w");
C)fileOut = fopen("prices.dat","a");
D)fileOut = fopen("prices.dat","b");

Question 38

____ makes an existing file available for data to be added to the end of the file; if the file opened does not exist, a new file with the designated name is created and made available to receive output from the program.

A)fileOut = fopen("prices.dat","r");
B)fileOut = fopen("prices.dat","w");
C)fileOut = fopen("prices.dat","a");
D)fileOut = fopen("prices.dat","b");

Question 39

A file stream is closed using the ____ function.

A)exit()
B)osclose()
C)fclose()
D)close()

Question 40

____ writes a string to a file.

A)fputc()
B)fputs()
C)fwrites()
D)fprintf()

Question 41

C appends the low-value hexadecimal byte ____ as the end-of-file (EOF) sentinel when a file is closed.

A)0x00
B)0x01
C)0x99
D)0xFF

Question 42

____ reads values for the listed arguments from the file, according to the format.

A)fgetc()
B)fgets()
C)fprintf()
D)fscanf()

Question 43

The function fgets() returns ____ when it detects the end of a file.

A)0x00
B)'\N'
C)'\n'
D)'\0'

Question 44

The ____ function call requires three arguments: an address where the first character read will be stored, the maximum number of characters to be read, and the name of the input file.

A)fgetc()
B)fgets()
C)fprintf()
D)fscanf()

Question 45

____ causes the same display as the statement printf("Hello World!");.

A)fprintf(stdout,"Hello World!");
B)fprintf(stdin,"Hello World!");
C)fprintf(stderr,"Hello World!");
D)fprintf(NULL,"Hello World!");

Question 46

fputc() is the general form of ____.

A)fput()
B)putc()
C)putchar()
D)fputchar()

Question 47

The statement ____ causes the string Hello World! to be printed directly at the printer.

A)fprintf(lprn,"Hello World!");
B)fprintf("lprn","Hello World!");
C)fprintf(prn,"Hello World!");
D)fprintf("prn","Hello World!");

Question 48

When working with random access files, the ____ function resets the current position to the start of the file.

A)rewind()
B)reset()
C)fseek()
D)flush()

Question 49

When working with random access files, the ____ function returns the offset value of the next character that will be read or written.

A) rewind()
C) fseek()
B) ftell()
D) flush()

Question 50

To write to a binary file you use the ____ function.

A) fput()
C) fwrite()
B) fputb()
D) write()