1. 2. Second Step for Learning C++ Programming • Data Type • Char • Float
• Double
• #define
• Comments

2. [Practice 01 Hello World]

3. [Explain 01 Hello World]

4. [Practice 02 Basic C++ Programming]

5. [Explain 02 Basic C++ Programming]
a Preprocessor directive
function header
start of function body
make definitions visible
message
insert a new line
more output
terminate main()
end of function body

6. [Practice 03 comments]

7. [Practice 04 #define]

8. [Explain 04 #define]

9. Const
You can add the const modifier to the declaration of a variable to tell the compiler that the value cannot be changed:
const double factor = 5.0/9.0;
const double offset = 32.0;
celcius = (fahr - offset)*factor;
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10. What if you try to change a const?
The compiler will complain if your code tries to modify a const variable:
const foo = 100; …
foo = 21;
Error: l-value specifies const object
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11. Const
Why use const? 1. const tells the compiler that a variable should never be changed. 2. Typesafe (partial) replacement for #define in C++ 3. May be used for increasing code quality
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12. Mathematical expressions have numeric values when evaluated.
Math Expressions
Mathematical expressions have numeric values when evaluated.
Some examples:
1+2
(fahr - 32)*(5/9)
1*(2*(3*(4*5)))
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13. [Practice 05 Math Operator Rules]

14. [Explain 05 Math Operator Rules]

15. [Practice 06 Addition of integers]

16. [Explain 06 Addition of integers]

17. a single byte, capable of holding one character
Basic Data Types in C++
char 
a single byte, capable of holding one character
int
an integer, typically reflecting the natural size of integer on the host machine
float
single precision floating-point
double
double precision floating-point
bool
a boolean value (true or false)
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18. Keyword auto enum restrict unsigned break extern return void case
float
short
volatile
char
for
signed
while
const
goto
sizeof
_bool
continue if
static
_Complex
default
inline
struct
_Imaginary do
int
switch
double
long
typedef
else
register
union

19. Simple Variables Name in C++Ο
int poodle;
//valid Ο
int Poodle;
//valid and distinct from poodle Ο
int POODLE;
//valid and even more distinct Χ
Int terrier;
//invalid – has to be int, not Int Ο
int my_stars3;
//valid Ο
int _Mystars3;
//valid – starts with underscore Χ
int 4ever;
//invalid because starts with a digit Χ
int double;
//invalid – double is a c++ keyword Ο
int begin;
//valid – begin is a Pascal keyword Ο
int __fools;
//valid – starts with two underscores Ο
int the_very_best_variable_i_can_be_version_112;
//valid Χ
int apple-4;
//invalid – no hyphens allowed

20. [Practice 07 Data Type]

21. [Explain 07 Data Type]

22. ASCII CODE

23. [Practice 08 char]

24. [Explain 08 char]

25. [Practice 09 float]

26. [Explain 09 float]

27. Repetition Control Structures3.
Third step for Learning C++ Programming ㅎㅎ
logical operator if
if else
switch
while
do while
for
Repetition Control Structures

28. && Operator (logical AND opterator)
&& is a boolean operator, so the value of an expression is true or false. ( cond1 && cond2 ) is true only if both cond1 and cond2 are true.
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29. || Operator (logical OR operator)
|| is a boolean operator, so the value of an expression is true or false. ( cond1 || cond2 ) is true if either of cond1 or cond2 is true.
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30. The ! operator (logical NOT operator)
The ! operator is a unary boolean operator
unary means it has only 1 operand.
! negates it's operand.
! means "not".
(! condition)
is true only when condition is false
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31. [ Practice 01 logical operator ]

32. [ Explain 01 logical operator ]

33. if (condition ) action;
if structure
The if control structure allows us to state that an action (sequence of statements) should happen only when some condition is true:
if (condition )
action;
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34. [ Practice 02 if ]

35. [ Explain 02 if ]

36. if else structure
The if else control structure allows you to specify an alternative action:
if ( condition )
action if true
else
action if false
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37. [ Practice 03 if else ]

38. [ Explain 03 if else ]

39. switch statement
Syntax switch (expression) { case const-expr : statements; break; case const-expr : statements; break; … default statements; break; }
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40. [ Practice 04 switch ]

41. [ Explain 04 switch ]
0 ≦ code ≦ 4

42. while Control Structure
The while control structure supports repetition - the same statement (or compound statement) is repeated until the condition is false.
while (condition)
do something;
the inside is called
the "body of the loop"
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43. [ Practice 05 while ]

44. [ Explain 05 while ]

45. do while
The do while control structure also provides repetition, this time the condition is at the bottom of the loop.
the body is always executed at least once do
somestuff ;
while ( condition );
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46. [ Practice 06 do while ]

47. [ Explain 06 do while ]

48. You can write any for loop as a while (and any while as a for).
for loops
The for control structure is often used for loops that involve counting.
You can write any for loop as a while (and any while as a for).
for (initialization; condition; update)
do something;
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49. [ Practice 01]