是否可以使用回车 \\r 而不覆盖已经写入的文本？

Question

Let's say I have printed Welcome in my console. If I use

printf(" Welcome");
printf("\rHello world.");

I only get Hello world. Is there any special command to get Hello world. Welcome Hello world. Welcome without printing Hello world and then Welcome. Basically, I want carriage return without overwriting the text. Is this possible in C?

Answer 1

No, it is not possible in ANSI C. Assuming you want this to be ANSI C, you will have to print "Hello, World." first and then print " Welcome" .

Otherwise, there are various solutions, including curses. See mevets's answer for a curses solution.

Answer 2

First try man curses , then man ncurses if that fails. Once you have found the curses documentation, the function you want is insstr , or possibly inch :

These routines insert a character string (as many characters as will fit on the line) before the character under the cursor. All characters to the right of the cursor are shifted right with the possibility of the rightmost characters on the line being lost

#include <ncurses.h>
#include <unistd.h>

int main() {
    initscr();
    printw("Welcome");
    refresh();
    sleep(2);
    insstr("\rHello, world. ");
    refresh();
    sleep(10);
    endwin();
    return 0;
}