4. Introduction to c++: Variable and data types summary: Basic Programming for Beginners
• 4. Introduction to c++: Variable and data ...
4. Introduction to c++: Basic Programming for beginners: Summary to variables and Data Types in c++
This is the third video in the series of videos for basic programming skill in c++.
This video basically introduces what are the variables and variable identifiers in c++, how are they used and why are they important and also how to use them to make a program more useful.
Key terms:
Variable: Portion of memory to store and determine a certain value.
Valid identifier: sequence of letters, numbers and underscore, and cannot start with number. Can start with underscore(_) but not recommended.
Reserved keywords: That are there already for compiler to use and we declaring them will just try to initialize again causing error.
List of reserved keywords:
asm, auto, bool, break, case, catch, char, class, const, const_cast, continue, default, delete, do, double, dynamic_cast, else, enum, explicit, export, extern, false, float, for, friend, goto, if, inline, int, long, mutable, namespace, new, operator, private, protected, public, register, reinterpret_cast, return, short, signed, sizeof, static, static_cast, struct, switch, template, this, throw, true, try, typedef, typeid, typename, union, unsigned, using, virtual, void, volatile, wchar_t, while
Operator words that may be reserved:
and, and_eq, bitand, bitor, compl, not, not_eq, or, or_eq, xor, xor_eq
List of fundamental data type:
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|| Type || Size || Range ||
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|| char || 1 byte || signed: -128 to 127 ||
|| || || unsigned: 0 to 255 ||
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|| short int || 2 bytes || signed: -32768 to 32767
|| (short) || || unsigned: 0 to 65535
==================================
|| int || 4bytes || signed: -2147483648 to 2147483647
|| || || unsigned: 0 to 4294967295
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|| long int || 4bytes || signed: -2147483648 to 2147483647
|| (long) || || unsigned: 0 to 4294967295
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|| bool || 1byte || true or false
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|| float || 4bytes || +/- 3.4e +/- 38 (~7 digits)
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|| double || 8bytes || +/- 1.7e +/- 308 (~15 digits)
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|| long || 8bytes ||+/- 1.7e +/- 308 (~15 digits)
|| double ||
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|| wchar_t || 2/4 bytes|| 1 wide character
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Variables can be initialized basically in two ways:
examples:
int a = 10;
or
int a (10);
string variable types can store bunch of characters.
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