c語言基礎，\r, \n, \r\n

Enumeration (or enum) in C

Enumeration (or enum) is a user defined data type in C. It is mainly used to assign names to integral constants, the names make a program easy to read and maintain.

enum State {Working = 1, Failed = 0}; 

 

定義枚舉類型：

Variables of type enum can also be defined. They can be defined in two ways:

// In both of the below cases, "day" is 
// defined as the variable of type week. 

enum week{Mon, Tue, Wed};
enum week day;

// Or

enum week{Mon, Tue, Wed}day;

 

https://www.geeksforgeeks.org/enumeration-enum-c/

 

 

//在linux系統下,printf函數是行緩沖式的輸出,當printf遇到\n時,或者緩沖區滿時,才會將緩沖區里的內容刷新到標准輸出(stdout).

\r = CR (Carriage Return) // Used as a new line character in Mac OS before X

\n = LF (Line Feed) // Used as a new line character in Unix/Mac OS X

\r\n = CR + LF // Used as a new line character in Windows

 

#include <stdio.h>//這一行不加也可以，但是會有警告。
enum State {Working = 1, Failed = 0};
int main(){
    enum State s;
    s = Working;
    printf("%daaaaaa\r123", s);
//    fflush(stdout);
    return 0;
}
                                                                  

　　

 

\n是另起一行，\r的話回到本行的開頭，如果繼續輸入的話會把先前的覆蓋掉

比如printf("asdflkj\r111")輸出的是111flkj