CODEWITHSUNDEEP
cpasswords
Mr ASD
Mr ASD

Reputation: 123

Getting an character as a password with "*" sign and match with your password

Hello I want to create a program that asks me for a two digit password. I have created the password and the password should match. If the first digit entered is wrong then immidiatly asks one more time , if the first digit is right then is one more left. It should runs just 5 times. If none of this 5 times is right it ends and when I type the password should be as star sign "*".

    #include <iostream>
    #include <conio.h>


int main(int argc, char** argv) {

    char password=0x00;
    int a=0;
   int b;
    char password2=0x00;
    int c,e;
    do{
        printf("\nEnter a character");

        password=getche();

       if(password=='1'){

        b=(passowrd-48)*10;

        password2=getche();

       if(password=='2'){

       c=password2-48;  

      e= c+b;
       }
}        
        a++;
    }while(e !=12 && a<10); 

        return 0;
    }

Maybe any hint?

Upvotes: 0

Views: 669

Answers (2)

KireinaHoro
KireinaHoro

Reputation: 585

What you want to do is get the char (password) but not echoing it, and put a "*" there as a place holder. First is done by getch(), which will not echo. Second is by having a putchar("*") following the input.

Here's the possible implementation.

#include <stdio.h> 
int main(int argc, char** argv) 
{ 
    char password; 
    int a = 0;
    // int a=0, b=0, c, e; 
    do { 
        printf("\nEnter a character");
        password=getch();
        putchar("*");
        if(password!='1') { printf("\n\n"); continue; }
        password=getch();
        putchar("*");
        if(password!='2') { printf("\n\n"); continue; }
        // The password is correct, do something here
        a++; 
    } while(a<10); 
    return 0; 
}

Also fixed the indents and blank lines in chaos and removed useless variables. password isn't used elsewhere except as a "buffer" for input, so it's OK to override it. You have already compared digit by digit of the password, no need to calculate what it is in decimal and then compare it.

Upvotes: 0

Michi
Michi

Reputation: 5307

This program should work on Windows but you should know that getch isn't a C standard library, nor is it defined by POSIX:

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


int main (void) {
    char password[20];
    int c,i=0;
    char ch = '*';
    while ((c = getch()) != '\n' && c != EOF){
        password[i] = (char)c;
        i++;
        putchar(ch);
    }

    printf("\nYour Password is %s\n",password);
    return 0;
}

Any way you could write the function getch yourself like this:

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

int getch(void);

int main (void) {
    char password[50];
    int c,i=0;
    char ch = '*';
    while ((c = getch()) != '\n' && c != EOF){
        password[i] = (char)c;
        i++;
        putchar(ch);
    }

    printf("\nYour Password is %s\n",password);
    return 0;
}

int getch (void){
    int ch;
    struct termios oldt, newt;

    tcgetattr(STDIN_FILENO, &oldt);
    newt = oldt;
    newt.c_lflag = newt.c_lflag & ~(ICANON|ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &newt);
    ch = getchar();
    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

    return ch;
}

Output:

michi@michi-laptop:~$ ./program 
******
Your Password is passwd

The getch function needs some fix, but at least you get an Idea.

Upvotes: 1

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