C + + Learning Journey-Example 1-The newcomer must come Hello world!

In fact, I feel this Hello world can not be a separate instance, but in order to facilitate the explanation, or to make it into a separate instance. The author is more accustomed to speaking only 1 to 2 knowledge points in an instance, so it is convenient for readers to understand and apply them.

Start a happy coding!

　　

#include <stdio.h>  int  main () {     printf ("%s"," Hello world! "); //      return0;  //

Enter the code Analysis phase:

1, first in this code, there is only the main function, the function is the entry of the entire program.

2. Call the printf () function within the function to output the string contents.

Start the function syntax description phase:

1. printf () function syntax:

int __cdecl printf (constChar * __restrict__ _format,...);

Parameter description:

1, Format: String formatting rules, such as the output string: "%s", output number: "%d" and so on;

2. The ellipsis after format indicates that content that needs to be output is passed according to the format parameter.

Well, the C language of Hello World is explained here, you are welcome to leave a comment.

　　　　

C + + Learning Journey-Example 1-The newcomer must come Hello world!