Formatting of Inputs/Outputs

Question 1

format short

Answer 1

4 digits after decimal, default format

Question 2

format long

Answer 2

14 digits after decimal

Question 3

format short e

Answer 3

5 digits plus exponent

Question 4

format short g

Answer 4

5 total digits with or without exponent

Question 5

format bank

Answer 5

dollars and cents format

Question 6

format hex

Answer 6

hexadecimal display of bits

Question 7

format rat

Answer 7

approximate ratio of small integers

Question 8

format compact

Answer 8

suppress extra line feeds

Question 9

format loose

Answer 9

restore extra line feeds

Question 10

format +

Answer 10

only signs are printed

Question 11

fprintf

Answer 11

writes data in user specified format, or displays data in command window
fprintf(format_string, variables)
% indicates where array is inserted into string, followed by conversion characters

Question 12

%f

Answer 12

fixed point notation

Question 13

%e

Answer 13

exponential notation

Question 14

%d

Answer 14

decimal notation

Question 15

%g

Answer 15

shortest form, %f or %e

Question 16

%c

Answer 16

characters shown on at the time

Question 17

%s

Answer 17

string of characters

Question 18

\n

Answer 18

linefeed: needed at the end of format string to start a new line

Question 19

\r

Answer 19

carriage return (similar to linefeed \n)

Question 20

\t

Answer 20

tab

Question 21

\b

Answer 21

backspace

Question 22

fopen

Answer 22

file_id = fopen(filename,permission)

opens file to read or save

Question 23

file_id

Answer 23

file_id = fopen(filename,permission)

identifier of text file, positive integer if file successfully opens, -1 if fopen fails

Question 24

permission

Answer 24

file_id = fopen(filename,permission)
string specifying mode in which the file is opened
‘r’ opens for reading only
‘r+’ for reading and writing
‘w’ delete contents of existing file and open for writing only
‘w+’ open for reading and writing
‘a’ open existing file or create new only for the end of the file
‘rt’(‘wt’ and ‘at’) specify that the file is opened in text mode
‘rb’(‘wb’ and ‘ab’) specify that the file is opened in binary mode (default)

Question 25

status

Answer 25

fclose(file_id)

=0 if file is successfully closed, -1 if fclose fails

Question 26

sprintf

Answer 26

write formatted data to string

Question 27

fscanf

Answer 27

reads formatted data into a matrix using conversion formats such as %d for integers, %s for strings, and %f for floats (doubles

Question 28

textscan

Answer 28

reads text data from a file and stores it in a cell array

Question 29

fget1 and fgets

Answer 29

read strings from a file one line at a time

fgets keeps the newline character if there is one at the end of the line, whereas the fget1 function gets rid of it

Question 30

feof( )

Answer 30

f End Of File

returns logical true if end of file has been reached, or logical false if not

Question 31

procedure for reading from files into strings

Answer 31

1. open the file, check if opening was successful
2. if opened successfully, loop until the end of file for each line:
   read line into a string
   manipulate the data
3. close file, check if closing was successful