W9 - INPUT FUNCTIONS

Question 1

W9-1: stdio module

Answer 1

_ Standard INPUT refers to the system KEYBOARD and standard OUTPUT refers to the system DISPLAY.  
_ The system HEADER file that contains the PROTOTYPES for the FUNCTIONS in this module is .

Question 2

W9-2: What is a BUFFER?

Answer 2

A BUFFER is a SMALL region of memory that holds data temporarily and provides intermediate storage between a device and a program.

Question 3

W9-3: UNFORMATTED INPUT

Answer 3

_ The function getchar() retrieves the next UNREAD character from the input buffer. 
_ getchar() returns either
    (a) the character code for the retrieved character
    (b) EOF:  the symbolic name for end of data. It is assigned the value -1 in the  system header file.

Question 4

W9-4: FORMATTED INPUT

Answer 4

_ The scanf() function retrieves the next set of UNREAD characters from the input buffer and translates them according to the conversion(s) specified in the format string.  
_ scanf() extracts only as many characters as required to satisfy the specified conversion(s).

Question 5

W9-5: Conversion Specifiers

Answer 5

_ Each conversion specifier begins with a % symbol and ends with a CONVERSION CHARACTER
_ The conversion character describes the TYPE to which scanf() is to convert the next set of TEXT characters.

Question 6

W9-6: Whitespace

Answer 6

_ scanf() treats the whitespace between text characters of the user’s input as a separator between input values. _ There is no need to place a blank character between the conversion specifiers.

Question 7

W9-7: Return Value

Answer 7

_ scanf() returns either the number of addresses successfully filled or EOF.  
_ The return code from scanf() does NOT reflect success of %* conversions or any successful reading of PLAIN characters in the format string.