I want to read one character at a time from standard input and operate on that. For example, input
abcdefghijklmnopqrstuvwxyz
What I want is, to operate on a
(which is the first character) as soon as it has been entered (the operation on a
should be done before the user enters b
) and then operate on b
and so on.
Maybe this other solution.
Taken from https://www.gnu.org/software/libc/manual/html_node/Noncanon-Example.html and https://ftp.gnu.org/old-gnu/Manuals/glibc-2.2.3/html_chapter/libc_17.html .
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
/* Use this variable to remember original terminal attributes. */
struct termios saved_attributes;
void
reset_input_mode (void)
{
tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
}
void
set_input_mode (void)
{
struct termios tattr;
char *name;
/* Make sure stdin is a terminal. */
if (!isatty (STDIN_FILENO))
{
fprintf (stderr, "Not a terminal.\n");
exit (EXIT_FAILURE);
}
/* Save the terminal attributes so we can restore them later. */
tcgetattr (STDIN_FILENO, &saved_attributes);
atexit (reset_input_mode);
/* Set the funny terminal modes. */
tcgetattr (STDIN_FILENO, &tattr);
tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
tattr.c_cc[VMIN] = 1;
tattr.c_cc[VTIME] = 0;
tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
}
int
main (void)
{
char c;
set_input_mode ();
while (1)
{
read (STDIN_FILENO, &c, 1);
if (c == '\004') /* C-d */
break;
else
putchar (c);
}
return EXIT_SUCCESS;
}
I think you want something like this.
#include <stdio.h>
int main ()
{
int c;
puts ("Enter text");
do {
c = getchar();
putchar (c); //do whatever you want with this character.
} while (c != '\0');
return 0;
}
Since you did not specify an operating system, I am going to give a suggestion suitable for the windows operating system.
The function GetAsyncKeyState()
does exactly what you ask for. You can read its documentation from this link .
As a quick example on its usage:
#include <Windows.h>
int main(void)
{
while(1) {
if(GetAsyncKeyState('A') & 0x8000) {
/* code goes here */
break;
}
}
return 0;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.