CareerCup

use curses.h or ncurses.h

#include <curses.h>
int main()
{
	initscr(); 
	char c;
	noecho(); 
	while((c = getch()) != '\n') {
		printw("*");
	}
	endwin(); 
	return 0;
}

compile:

gcc -lcurses a.c

Use printf("\r") in C - its called carriage return. This goes to the beginning of the current line on the command prompt instead of going to the beginning of new line.

You can maintain 2 strings, one string you will append real characters, in another string you will add *. so for display you can * string, for validation of password, you can use real string.
I may be not understanding the problem. you can give more details.

char c;
	std::string s;

	for ( ;(c = getch()) && c != 13  ; )
	{
		s.push_back(c);
		putch('*');
	}
	printf("\n%s to verify the logic...",s.c_str());

ofcourse 13 is value for \n

#include <termios.h>
#include <unistd.h>

void echo( bool on = true )
  {
  struct termios settings;
  tcgetattr( STDIN_FILENO, &settings );
  settings.c_lflag = on
                   ? (settings.c_lflag |   ECHO )
                   : (settings.c_lflag & ~(ECHO));
  tcsetattr( STDIN_FILENO, TCSANOW, &settings );
  }

the function echo in linux will disable or enable the printing of characters entered entered by the user . This can be used to impement the password functon as in LINUX where the characters entered by the user are not visible.

# include<stdio.h>
# include<conio.h>
main()
{
	int i=0,j;
	char pass[23],c;
	printf("enter your password\n");
	while((c=getch())!=13)
	{
		pass[i++]=c;
		printf("*");
	}
	pass[i]='\0';
	printf("the password that you have entered is %s",pass);
	getch();
}

Instead of thinking in code think in words: you want to turn echoing off from a terminal or console. Echoing is a concept where input scanned from the keyboard is displayed on screen. You can turn this on (usually on by default) or turn it off. Under *nix based operating systems, curses is the usual choice for manipulating terminal properties.

write a c program to display

abcdedcba
abc cba
ab ba
a a

i want password code for linux gcc compiler