HPR1768: An Intro To C Episode 1 : Introduction and Types

Episode 1: History and Basic Types

Explain who you are and what you do.

• Name: Colin Mills, (cjm)

• Occupation: Software Engineering Student in Canada

• I have been a UNIX geek and open source software FANATIC for about four years now.

• Website: c-jm.github.io

Start to go into the history of C and explain where it came from.

Abstract

C was originally developed by Dennis Ritchie between 1969 and 1973 at AT&T Bell Labs,[5] and used to (re-)implement the Unix operating system.[6] It has since become one of the most widely used programming languages of all time, [7][8] with C compilers from various vendors available for the majority of existing computer architectures and operating systems. C has been standardized by the American National Standards Institute (ANSI) > since 1989 (see ANSI C) and subsequently by the International Organization for Standardization (ISO).

• From: Wikipedia On C

Explain Types and their meanings

• SIGNED: It means it can hold either negative or positive values.

• UNSIGNED: Unsigned means it can only hold positive values.

Retrieved From: Wikipedia On Signedness

int:

• An int is a variable that is at leas 16 bits in size.

• It is actually the most efficent for the processor itself.

• Capable of storing -32767 -> 32767

Int Specifiers

• short: 16 bits in size

  short int intThatIsAShort = 0;

• long: 32 bits in size

  long intThatIsALong = 0;

• long long: 64 bits in size

  long long reallyBigInteger = 0;

char

• One byte in memory. (8 bits).

• Holds a character but can also hold a number

  char thisCanHoldALetter = 'x'; char thisCanHoldANumber = 72;

Note about the ascii table

• ASCII is just a number corresponding with a letter.

• Look here for more information.

float

• Holds floating point numbers

  float thisIsAFloat = 72.2;

Double

• Like a float but bigger.

  double thisIsADouble = 0;

Arrays

• Arrays are collections of multiple things

• Have to be a set size.

• Use braces to initalize

• If you initalize one you initalize all.

  int arrayOfNums[100] = {0};

Strings

• "Strings" are made up of mutliple chars. (Yes it does make sense! :))

  char arrayOfChars[81] = {0};

• Null termination is added to the end.

  '\0'

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