subsititue of getchar and clrscr() in c for linux

Question

I am working on Ubuntu these days. When I compiled my C program using gcc, it is giving the error conio.h doesn't exists. I want to use clrscr() and getch() function. Can you please tell me the substitute of this header file in linux.

Answer 1

The getch() function can be found in curses.h (library "curses"). The same library offers functions to clear the screen. Check out these links:

http://linux.die.net/man/3/getch

http://linux.die.net/man/3/erase

Answer 2

system("clear"); can be used in linux instead of clrscr();

Answer 3

# include <curses.h>

       int erase(void);
       int werase(WINDOW *win);
       int clear(void);
       int wclear(WINDOW *win);
       int clrtobot(void);
       int wclrtobot(WINDOW *win);
       int clrtoeol(void);
       int wclrtoeol(WINDOW *win);

DESCRIPTION
       The erase and werase routines copy blanks to every position in
       the window, clearing the screen.

I'm guessing this question was repeatedly downvoted because it implies a poor understanding of basic C language features and/or that OP is simply copying/pasting code into editor/IDE.

Similarly, just use system("exit"); within your code:

#include<stdlib.h>
main()
{
system("clear"); //clears the screen
} 

Checking the man-pages shows:

SYSTEM(3)                                 Linux Programmer's Manual   SYSTEM(3)

NAME
       system - execute a shell command

SYNOPSIS
       #include <stdlib.h>

       int system(const char *command);

DESCRIPTION
       system() executes a command specified in command by calling /bin/sh -c 
command, and returns after the command has been completed.  
During execution of the command, SIGCHLD will be blocked, and SIGINT
and SIGQUIT will be ignored.

---

It could also be the case that this question is a possible duplicate of the following:

• How to implement getch() function of C in Linux?
• Why can't I find <conio.h> on Linux?
• GNU/Linux replacements for Turbo C functions `clrscr` and `cprintf`
• Function clrscr in C and C++
• "UNDEFINED REFRENCE TO clrscr();"
• Substitute for getch(), gotoxy(), delay(), clrscr()
• What is Equivalent to getch() & getche() in Linux?

Finally, take a look at the following for more details and examples:

• http://tldp.org/HOWTO/NCURSES-Programming-HOWTO/scanw.html#GETCHCLASS
• http://ubuntuforums.org/showthread.php?t=549023

Answer 4

Apparently you didn't try googling.

There are no direct alternatives.

This blog post: http://wesley.vidiqatch.org/code-snippets/alternative-for-getch-and-getche-on-linux/ provides you with alternatives for getch() and getche()

Alternatively you can use libncurses to do what you want: http://tech.dir.groups.yahoo.com/group/linux/message/29221

Answer 5

curses.h is an alternative for conio.h. install build-essentials and install libncurses5-dev.

Then you can work with that functions. [http://ubuntuforums.org/showthread.php?t=880601][1]

Answer 6

I was tinkering around with some codes; after i installed ncurses, I inserted these codes:

#include <stdio.h>
#include <ncurses.h>

main ()
{

system ("clear");
getchar ();

}

Answer 7

There is another way to do it through C code instead system call.

void clrscr(void) {
  fprintf(stdout, "\033[2J\033[0;0f");
  fflush(stdout);
}

I found it long time ago and I've checked it on raspbian successfully.

And also:

void gotoxy(int x, int y) {
  printf("%c[%d;%df",0x1B, y, x);
}

I hope it helps you.

Regards.

Answer 8

In G++ Compiler, we use system("clear") function defined in stdlib.h header File

#include<iostream>
#include<stdlib.h>

int main() {
  std::cout<<"Hello Aliens:";
  system("clear");
}