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C > Miscellaneous Code Examples

Program to Input Password for Validation of User name

Program to Input Password for Validation of User name

How to Input Password in C ?

    Accept Character without Echo [ without displaying on Screen ]
    getch will accept character and store it in "ch"

    ASCII Value of "Enter Key" is 13
    Stop Accepting Password Characters after "Enter" Key.

    ASCII Value of "BACKSPACE" is 8
    After hitting "backspace" following actions should be carried out -
        Cursor Should be moved 1 character back.
        Overwrite that character by "NULL".
        After Writing NULL again cursor is moved 1 character ahead so again move cursor 1 character back .
        Decrement Current Track of Character. [j]

    Store Accepted Character in String array .
    Instead of Displaying Character , display Asterisk (*)

#include<stdio.h>
#include<conio.h>

void main() {
   char password[23], ch;
   int j;

   clrscr();
   puts("Enter password : ");

   while (1) {
      if (j < 0) {
         j = 0;
      }
      ch = getch();

      if (ch == 13)
         break;
      if (ch == 8) /*ASCII value of BACKSPACE*/
      {
         putch('b');
         putch(NULL);
         putch('b');
         j--;
         continue;
      }

      password[j++] = ch;
      ch = '*';
      putch(ch);
   }

   password[j] = '\0';
   printf("\nPassword Entered : %s", password);

   getch();
}

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