Lecture 6

Question 1

Code Library

Answer 1

Allow you to have additional functionality by letting you access functions on that file. Libraries typically include a header and implementation file.

Question 2

Header file

Answer 2

Contains definitions and declarations for functions in the library and shows you how to access those functions.

Typically includes the extension .hpp or .h. Extension not needed when using libraries from the c++ standard library since the extension is implied.

Question 3

Implementation file

Answer 3

Includes commands and details. Typically includes the extension .c or .cpp. Extension not needed if it is part of the c++ standard library.

Question 4

.h or .hpp

Answer 4

Extension for header file. Pp stands for plus plus

Question 5

.c or .cpp

Answer 5

Extension for implementation file. Pp stands for plus plus.

Question 6

Benefits to using libraries

Answer 6

1. Separation of ideas in code
2. Reuse code in libraries so you don’t have to come up with it again.

Question 7

Object file

Answer 7

Machine instructions that the program, header, and implementation files are each compiled in to.

Question 8

include

Answer 8

Allows you to access a library when followed by the library name in <> or “”

Question 9

include convention

Answer 9

<> for c++ standard libraries
“” for other libraries

Question 10

Linker

Answer 10

Combines the object file from the main program with the library’s object file to make an executable file.

Question 11

Executable file

Answer 11

File that has all the information needed from both the program file and the library file. Can run on it’s own.

Question 12

When are libraries compiled?

Answer 12

Ahead of time–if you write your own, you will need to compile it ahead of time as well.

Question 13

C++ Standard Libraries

Answer 13

Libraries that come with C++ download

Question 14

Common standard libraries

Answer 14

Cmath, ctime, iostream, cstdlib

Question 15

Function

Answer 15

Made of function name followed by arguments in parentheses and commands that follow in curly braces

Question 16

Function call

Answer 16

When the name of the function followed by the arguments in parentheses appears in the code. Function call is replaced by the value returned by the function.

Question 17

Pseudorandom numbers

Answer 17

Numbers generated to appear random since it is difficult for deterministic computers to generate completely random numbers.

Question 18

Rand()

Answer 18

Function that generates random numbers (needs cstdlib)

Question 19

Srand()

Answer 19

Sets the seed for pseudo random number generation

Question 20

Time()

Answer 20

Gives the current time. Needs ctime library. Is great for pseudorandom seed generation. The argument needs to be set to 0

Question 21

Seed value

Answer 21

The argument for srand(). Number from which the pseudorandom numbers will be generated.

Question 22

How to get a random number between 1 and some number

Answer 22

Use the modulus operator for some number and add 1

Question 23

Boost Libraries

Answer 23

Includes libraries that have been extensively tested and are safe to use. Some boost libraries have been added to the C++ Standard Libraries. Found at boost.com

Question 24

Pow()

Answer 24

The power function takes the arguments number and power the number should be taken to

Question 25

Www.cplusplus.com

Answer 25

Reference for libraries and functions you don’t know