Learn How to Program

if you want to preview the code that you've already made, you can use "printf" to view it
let's start the lesson.

If you start the program, it will output "Hello World"

•Why i use ";" in the end of all the row?.
    ○Yeah, we should write that after the finish a row.
•And what is "getchar()"?.
    ○Its for hold the screen that we can read the "Hello World".
    ○If we didn't use "getchar()", after we run the program, it immediately close the ...
    ○If you want to see it, just try to delete "getchar()" and you will see what will happen.




if you want to input the output from the keyboard, we use "scanf"

And run it, you will ask to input your name from "printf("enter your name");".
You input a word then you press enter, it will ouput what you wrote before.

•What is "char  name[10];".
   ○ "char" is called data type, data type are "char, int, float".
   ○ "name[10]" it means, data type name has only contains 10 character.
   ○ We must use sign "[]" if we want to use char data type.
   ○ You can change "name" to another word.

•scanf("%s", &name) & printf("%s", name);
   ○ scanf("%s", &name) will save the objects in the memory and the memory will called "name" if you write "name".
   ○ You can change "name" to another word.
   ○ printf("%s",name") will show the object that you save in memory called "name"

 
•What is "%s".
   ○It is a format typing.
   ○It use for char data type.
   ○If you want to use int data type you use "%d" etc, you will know more later.

•fflush(stdin)
   ○ It remove the buffer in the buffer of I/O

•The green words mean a comments
   ○ It wont affect the code if you use "//" or "/* (your comment) */
   ○ "//" just for 1 row
   ○ "/* is for long comment, it will stop until you write "*/"



I'll give you some exercise,
Click here to check your skills.