// escape.c
printf("??ab?c\t?dfrge\rf\tg\n");
printf("??ab?c\t?dfrge\rf\tg");

printf("Hi there!\b, ");
printf("welcame!\b\b\b\bo\n");
printf("Please type your name: ____.\b\b\b\b");
scanf("%s",name);
----------------------------------------
Output:
Hi there, welcome!
//输入John
Please type your name: John.

printf("bbbbbbb\ta"); putchar('\n');
printf("bbbbbbbb\ta");
----------------------------------------
Output:
bbbbb   a
bbbbbbbb        a

printf("??ab?c\t?dfrge\rf\tg\t");
----------------------------------------
Output:
f?ab?c  gdfrge

//Environment: Ubuntu 20.04, gcc, zsh
//Not sure about whether this will work on windows.
//Windows 10 and windows terminal support ANSI escape sequence
//so if you are using them, this should work properly.
#include <stdio.h>
#include <unistd.h>

int main(){
    printf("Hello, Welcome to this ANSI escape sequence test\n");
    printf("\033[33mNow, we are printing in yellow\n");
    printf("\033[4mYou can also underline sentences.\n");
    printf("\033[0;31mBesides, you can print in red.\n");
    printf("\033[0mHopefully, you understand what's happening.\n");
    sleep(8);
    printf("\033[0m\033[2J\033[H");
    printf("\033[32mTry to input something,press CTRL-D to end input\n");
    while(getchar() != EOF);
    printf("\nYou see, text you typed in are green.");
    return 0;
}

#include <stdio.h>
#include <unistd.h>

void PrintProgressBar(int progress, int interval, int theme){
	//progress is a number in range [0,100] indicating the progress of a work.
	//interval is the time waited between each function call. Count in seconds.
    //theme is the choice of theme in which the progress bar is presented.
    putchar('\r');
    printf("\033[?25l");
    static int in_frame = 0;
    const int MAXWIDTH = 50;
    const char frame[] = {'|','/','-','\\'};
    const int FRAMELEN = 4;
    int width = progress*MAXWIDTH/100;
    switch (theme){
        case 1:
            // \ | / - and number in the end
            printf("%c  %d%%", frame[in_frame],progress);
            in_frame = (in_frame + 1) % FRAMELEN;
            break;
        
        case 2:
            putchar('[');
            for(int i = 0; i < width; i++){
                putchar('=');
            }
            putchar('>');
            for(int i = width+1; i <= MAXWIDTH; i++){
                putchar(' ');
            }
            putchar(']');
            printf(" %d%%",progress);
        default:
            putchar('[');
            for(int i = 0; i < width; i++){
                putchar('=');
            }
            putchar('>');
            for(int i = width+1; i <= MAXWIDTH; i++){
                putchar(' ');
            }
            putchar(']');
            printf("  %c %d%%", frame[in_frame],progress);
            in_frame = (in_frame + 1) % 4;
    }    
    printf("\033[K");
    sleep(interval);
    //Linux uses line buffer when printing in terminal,which means
    //that you need to tell the terminal when to end the line
    //by sending a newline character, printing enough content to fill up the buffer
    //or getting an input.
    //
    //Since we are always on the same line printing short sentences,we satisify 0 of 3 conditions. 
    //There's no way that computer will print the content in buffer.
    //so we need to use fflush whose function is 
    //telling the computer to print all characters in buffer.
    fflush(stdout);
}


int main(){
    for(int i = 1; i <= 100; i++){
        PrintProgressBar(i,1,0);
    }
    printf("\033[?25h");
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(){
    const int syn_size = 2,TIME = 100;
    char syn[][1000] = {"└|``┌|","|┐``|┘"};
    printf("\033[?25l");
    for(int T = 0; T < TIME; T++){
        for (int i = 0; i < syn_size; i++){
            printf("\r%s", syn[i]);
            fflush(stdout);
            sleep(1);

        }
    }
    printf("\033[?25h");
    return 0;
}