Parsing

Question 1

Where are command line arguments stored?

Answer 1

In the args array in main.

Question 2

What is the built in GNU C++ agrument decoder?

Answer 2

getopt

Question 3

What library is getopt stored in?

Answer 3

<unistd.h>

Question 4

What are the 4 most common items in getopt?

Answer 4

• getind
• optarg
• optopt
• getopt

Question 5

What is the getopt variable optind?

Answer 5

An int index that tells the user where the next peice of info is stored

Question 6

What is the getopt variable optarg?

Answer 6

Set to the value of the next argument, if they exist.

Question 7

What is the getopt variable optopt?

Answer 7

Stores the value for an invalid argument if a ‘-‘ is provided with an unspecified argument.

Question 8

What is the getopt function getopt?

Answer 8

The function that takes argc, argv, and char * containing the arguments that you want to include in the environment.

Question 9

What are the return values of getopt()?

Answer 9

• An int rpresenting the next char in the argv array.
• -1 if there are no more arguments
• ’?’ or if there is an unrecognized character.

Question 10

How must the getopt function be used?

Answer 10

In a looped manner to access all of the arguments.

Question 11

In the char * argument getopt() function, what does a “:” signify?

Answer 11

That an argument must be provided after this flag. Ex: ‘-f:’ means a file name is expected after.

Question 12

What is the more advanced versiont of getopt?

Answer 12

getopt_long