printf()

• Example Print "Hello, World"
• printf is the function to print output on the console.
• The ; is treat as the end of the code (per function) as . end of the sentences.

#include <stdio.h>

int main() {
	printf("Hello, World!\n");
	return 0;
}

return

• Use when the code is end.
• the return value of 0 means the code run without any error.
• if the return value is 1 or other value that means that the code is exit WITH error.

What is #include <stdio.h>

• In this part is called pre-process.
• That means it import the things we need for this code/project
• For example, printf() is come from the <stdio.h>
• <stdio.h> means standard input and output.
• .h is header documents of c.

What is main/entry function

• Example: The place we achieve our logic

• It run the logic line by line.
• and the main() is the entry function of C, It's required for a c programme.

INFO

While int main() means the data type returned by the function of main().

int main() {
	printf("Hello, World!\n");
	return 0;
}

A complete procedure of HelloWorld.c