Last thurusday I go to Microsoft of Korea branch for my lecture.
The instructor is Seong-yeop Kim who is director of tipssoft. He is microsoft MVP of c++ programming.
I learn about what is programming and data type of C language.
Preparation Material : structuring C Development environment.
First, What is the programming??
We must know algorithm. Program can define expresssion of the plan, and file created in a language that (your computer understands what the computer will do)-this is algorithm.
So programming is defined to make program.
But if we write the program for C, we need the translator for machine language(composed 0 or 1).
The translator is named compiler. It translate the programming language for machine language.
Similarly, We can fine interpreter. for example python, HTML, Javascript.....all of these are interpreting language.
The difference between compiler and interpreter is translating into machine language at once or one line into machine language.
Compiler vs Interpreter
Second, Introduce about C language.
It was make by Dennis rich in 1972. It has been used to develop UNIX which is OS.
The characteristic of C is four representative examples. First, it is structured language. Second, it gains high portability. Third, it is good at expansion and various expression. Fourth, It is high productivity.
Programming language need a few definition.
input grammar : write the information you want
print(output) grammar : display the information you want
constant : Limited input destination
operator : processing the operating function
variable : The space which memory the input value and operating result
conditional grammar : process according to condition
Iterative grammar : the iterative behavior until you want to stop it.
Third, the sentence structure of the C language.
(Your operate); <-- semicolon : finish point about unit of processing.
If you want to order 2 operation. You use the { }.
ex.
if(1)
{
printf("abc");
printf("def");
}
and If you want to remain the remark. use the /* (contents) */
ex.
/ conditional grammar */
if(1)
{
printf("abc");
printf("def");
}
Four, Data type
Do you know bit? bit is base unit of memory. it memorize 2 statement about 0 or 1.
Byte is unit of memory structured 8-bit.
we need the sign about number, so developers make the sign-bit. It is leftmost bit called the highest bit.
If so, why we learn the data type??
the answer is simple. we make the better program about smaller volume and faster processing.
--Data type--
char : 1-byte space, express the integer number. But it used to express the character because ASCII code. -128~127
(p.s the concept of ASCII https://en.wikipedia.org/wiki/ASCII)
unsigned char : there are no minus. 0~256
short int : 2-byte space. that use to express the small value. -32,768~32767(=2^15-1)
unsigned short int : 0~2^16
long int : 4-byte space. that use to express the integer number generally. so that almost use just (int). -231~231-1
unsigned int : 0~2^32
float : 4-byte space. that use to express the real number. but it isn't generally use, because it has error very often.
double : 8-byte space. this is fewer errors than float data type. so this is used generally about real number.
This is First lecture about Tips. I would appreciate your vote if it helped. Have a nice study.