To enter password without displaying it

In a password checking program,when the password is enterd it should not be displayed.Which function should be used for that? If scanf() and gets() are used the text entered will be displayed.

I don't believe there is a way in standard C to do that. You can use a nonstandard function such as getch to do what you want.

In Windows, you can turn off echo for any standard input function with SetConsoleMode().

Code:

#include <stdio.h>
#include <windows.h>

int main()
{
    HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); 
    DWORD mode = 0;
    char buff[25];

    GetConsoleMode(hStdin, &mode);
    SetConsoleMode(hStdin, mode & (~ENABLE_ECHO_INPUT));

    fgets(buff, sizeof(buff), stdin);

    SetConsoleMode(hStdin, mode);

    printf("You entered: %s", buff);

    return 0;
}

In *nix you can use the "termios" interface to disable echo.

Code:

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

int main()
{
    termios oldt;
    tcgetattr(STDIN_FILENO, &oldt);
    termios newt = oldt;
    newt.c_lflag &= ~ECHO;
    tcsetattr(STDIN_FILENO, TCSANOW, &newt);

    fgets(buff, sizeof(buff), stdin);

    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

    printf("You entered: %s", buff);

    return 0;
}

gg

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